Critical thinking should disobey before being reasonable.

The freedom of questioning everything - reason included - and the defying of received opinion and of face value must be unfettered.
 
The difference between a critical and a complacent person is the difference between an open and a closed mind.

Those who profess that critical thinking is nothing but inspecting beliefs and arguments to be realistic and disciplined, put a yoke on their own neck and then preach freedom. Among all of them, "critical thinkers", is there one who is a critical thinker?

A critical mind - with its intuitive movement, its common-sense judgements and its more orderly reasoning - tests itself and the world with no holds barred, always ready to question certainty, anew. The first instinctive move of critical sense is not to be self-satisfied and sufficient, to resist complacency and sway, to differ, not to conform or be awed by authority. Realism, verification and method of argumentation trot behind as a necessary second move, but do not make much critical difference without the initial spontaneous move of critical initiative.

The critical thinker respects authority only on merit and accepts received knowledge and truth only after understanding it.

I claim that what is called and taught today under the ambitious name "critical thinking" as it it were the whole process of the critical attitude at work in the world, is incomplete, only one face of the coin. We are presented with a critique of thinking, but the other living face of this Janus, critical spirit, the gadfly, the seeker of "something else" the one prone to revise belief, is ignored, swept under the carpet.

The manuals of “critical thinking”, while teaching  how to evaluate credibility and soundness of claims, by showing what is good and bad argument, also prescribe what truth is, what must happen in our head, what criteria to use, as if those axioms and criteria were sacred,  above suspicion; but they are not. Those things are themselves subjects of critique. Such manuals are rich with procedures, skills, logical rules and examples of fallacies, vital knowledge, but incomplete; if you just learn and follow the rules, your thinking will be utterly uncritical. I dare you that this much is not enough for critical thinking.

Yes, it is great education to learn courses and read good books of critical thinking... provided you take time to forget all the petty little rules and procedures, and include that general culture into your commonsense, good judgement.

To make this simple: critical thinking is in my view the one by which you have the courage, at any time needed, to draw a line and say, like one mortal living here and now: “Now I will think for myself, with as little as I know, as reasonably as I can, and I will decide what is true for me and what not, what is good for me and what is bad, what I like and not, what I chose or reject, what to refrain from and what to do.”

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Something else, liberation, our own point of view, fairness, new truth, agency, life – not just sheepish imitation and copies of copies of thought - comes from discontent, first intuitive or irrational and later, hopefully, justified. Creation is undoing, changing, replacing. It is asking: “Why so?” and “Why not otherwise?”  It certainly needs to demolish the given and requires a disorder space to turn; at least here in your mind, where your freedom to swing your fist does not meet someone else’s nose.

Your critical thinking is personal. It follows your interest and intentions and is grounded by your understanding, the image in your mind, not someone else’s. It is a core part of your freedom to consider any choices, to be an autonomous agent, a person starting new things. It is not neutral. We have the right to feel and to say no in our mind, long before we ground our opposition by strict argument to justify criticism with valid proofs. That will come later. Any creation, any thought of change says “no!” to what is. Or, it says “yes” to something else which is not. Not yet.

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However, if we are not mad, we become accountable, morally and logically, for the conclusions we make ours and when thoughts come out in words and deeds. When we cast our criticism among people we must be reasonable, moderate and constructive as persistently as we were anarchic inside the crucible of our mind. Often we must wisely chose to express it in veiled irony or question form. To paraphrase the common place of the notorious Dr Johnson, We may follow Fancy for our guide but must take Reason as our companion. [1]

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[1] The original said “We may take Fancy for a companion, but must follow Reason as our guide.” —DR. SAMUEL JOHNSON, letter to James Boswell in: Boswell James, The life of Samuel Johnson..., vol. 1, Carter, Hendee and Co, Boston, 1832

No doubt criticism is a critical situation. Yet another time when character shows. And skill. 

Like hunting, criticism feels as a noble sport or an assassination; depends on which side of the gun you are. 

When we give criticism we judge it fair but we seem born to take criticism as surprise, stoning and humiliation.
 
This is quite undiscerning. You can give and find value in critique, hidden precious stones even in the mud of bad criticism.

 There are three kinds of criticism: friendly, indifferent and hostile, each with its intention. Do not confuse them. They have different aims and rules which you should recognize when you give critique and also when you receive it.

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Critique in all its forms, will not be received on merit. It will not simply win by the force of argument and the crystal clarity of Truth. Not at all. The business of critique concerns persons and requires rhetoric and tact; credibility, the right occasion, intentions and words clearly understood. Without which it will confuse and it will be rejected. Or, it will do the opposite of what was intended.

Criticise when you feel you have a right to do it and when it is also wise and timely to do it. Moreover, critiquing without asking yourself first for which cause you do it now and even more with which purpose, is a vicious bad habit. When being criticised, the urgent thing is to observe that you are criticised, so that you control your response.  

Do not argue with critique, it is not ping pong, not a dispute of wits or a negotiation, or an academic search for truth. It is most often feedback and evaluation. Handle it. Listen and to ask yourself which kind of it you face and why.  Friendly? Objective? Hostile? You give or receive the three modes with a different mind.
  
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Friendly criticism is a gift to help the one criticised; the critique takes the side of the person and its aim is to improve, to protect, to warn and to help succeed. With such a purpose, as a critic, you test carefully, correct the weak points and advise what to improve. You protect and encourage. This is work for the wise.

Objective criticism, indifferent as I like to call it, this sort of critique is insensitive to persons: It serves some impartial discipline, an institutional goal, work, or a wider, higher and abstract ideal – truth, beauty, religion or justice, profit, excellence... so that it has no friends.
 
Mostly harmless, often precious, it turns inhuman at times. It does not mind people, it is meant to correct, to perfect, to redress and bring to task, to do everything towards precision, beauty, excellence or success.  It does what is needed, nothing personal.

Hostile criticism is to defend or to attack, to reject, to punish, to subvert, even to hurt and to destroy. Unfavourable, it works to at least contain and make things hard for the target. 
 
While defending against something, this critique is aimed at enemies and bad competitors; not to improve but to unsettle and to reject them, to belittle, to punish or even to destroy. It tries to stop, to contain, to make things harder or to discredit and ridicule. Unfavourable, what it wants to avoid is being of any help.

Always ask yourself which kind of criticism you face. Accordingly, you handle these three critiques in different ways. 

To read more go to http://wisdom.tenner.org/three-kinds-of-criticism.html