Criticisms can help us improve, but only if they contain constructive information.
Some examples:
Useless criticism: this result is unacceptable.
Constructive criticism: this result is unacceptable because it contains this specific form of artifacts.
Useless criticism: this presentation is uninteresting.
Constructive criticism: this presentation is uninteresting because I do not care topic X and would rather hear more about topic Y.
As a recipient, I feel excited about constructive criticisms, even if they are harsh or contain personal attacks. In contrast, I usually ignore non-constructive comments because they provide nothing I can act upon.
Non-constructive criticisms are a waste of time at best, and look like whining at worst.
