Maybe I should again point out that I don't defend their behavior, I just ask that people don't set up expectations that very few people would live up to when they are experiencing disappointment.

Criticism in itself is valuable. Constructive criticism may be more valuable, but one a flaw is pointed out, someone else might start being constructive about it.

I suspect some of these people are resistance driven. I tend to be myself. If I say "this function isn't good enough!" and people said "Yes. You're right!" then I'd usually not have anything more to say about that. But if people keep arguing against it, I'd keep the subject going until I know they see my main points.

This thread relevant?