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Yes, the criticism to make something better, with good intentions, exists, of course it does. The one that someone tells you with the purpose of making what is being done better.
But in the same way there is the person who criticizes to judge in a bad way, with the intention of doing harm, to that one you should not pay attention at all, at least I prefer to ignore it.

You're absolutely right. I'd say you must have a balance of pride and humility to be able to take great criticism and to ignore the one which is unconstructive