People who take criticism well are not calmer than everyone else. They have simply learned to put a gap between the sting and the reply — and almost everything useful happens inside that gap.
Defensiveness is a reflex, not a decision
John Gottman lists defensiveness among the responses that reliably wreck a conversation, and its trademark is speed: the rebuttal is already forming while the other person is still talking. That is why it feels like thinking and is not.
The counter-move is mechanical: hear it to the end, without a single interruption. It costs about twenty seconds and it removes the most common failure — answering a version of the criticism that was never made.
Separate the message from the delivery
Feedback usually arrives badly wrapped: at the wrong moment, in the wrong tone, from someone who was annoyed. The wrapping is real and it is not the content, and treating them as one thing is how a true remark gets thrown away with the rudeness it came in.
Two questions do the sorting. What exactly is being described — an act, a pattern, a result? And would this be worth knowing if a friend had said it kindly? If yes, you now have information, however it was delivered.
Ask what, not why
«Why are you saying this?» starts an argument about motives. «What exactly — can you give me an example?» starts an argument about facts, which is the only kind that can be settled.
Vague feedback is not necessarily wrong, it is unfinished. Asking for the instance either produces something you can act on, or reveals there was nothing behind it — and both outcomes are better than agreeing politely and going away confused.
Check it before you accept or reject it
Taking every criticism at face value is not humility; it hands anyone in a bad mood the power to set your view of yourself. Rejecting all of it is not confidence either; it just means you have stopped receiving data.
The practical filter is repetition. One person's remark is a data point. The same remark from three unconnected people over a year is a fact about you, and it deserves work regardless of who said it or how.
Do something, then say what you did
The most common failure at the end is agreeing sincerely and changing nothing. From the outside this is indistinguishable from not listening, and it teaches people to stop telling you things.
So close the loop. Change one thing, then go back and say it: «you were right about the totals — I've started checking them before I send». Two sentences, and the next person who has something hard to tell you will find it cheaper to say.
One hundred ways to look at yourself
Reading about it is one thing. Ten of the tests are open right here — no install, no account, nothing saved.