I've never worked at a place where a person like this is acceptable. I've been told too many times that I was too negative when in fact I was just being realistic.
Same thing, and I view that as a big flaw in how a lot of companies think. Constructive criticism should be rewarded, partly because it's useful, partly because it's a lot harder to be constructive than a lot of people think.
It holds true in all fields, too. Creative writers open to criticism are always better than writers who refuse to listen to criticism. The best creative writers are the ones who take criticism, then explain why they did what they did, and possibly educate the critic as to a part of writing. I had a teacher who defended Joyce like that to me, once, and it did me worlds of good.
