My co-therapists became hysterical and insulting when I wanted to leave group therapy. I was never rude. They were vicious.

Years later, I criticized a book psych textbook on Amazon, arguing it was condescending, backing my assertions with examples. Two colleagues and the author tried to nullify and discredit my opinion, one with a ferocious string of name-calling (he later somewhat softened when I reflected back his spite.) Clients in the discussion understood my viewpoint well. The professionals resisted all feedback.

Admittedly, I have a narrow a window on the larger universe of mental health providers. But I've experienced people very much self-serving and protective of their dominion.