I think this notion - which Linus pushes - that the alternative to yelling at people and generally being short tempered is always "political correctness" ... well it's quite harmful. Yes, it CAN get that way, if people interpret criticism of their work as personal criticism and try to shut it down by complaining about it. I've seen that happen before. Some people don't know how to handle someone implying, even if politely, that their work sucks and can't handle it. But that doesn't mean it has to be that way and well functioning teams manage to avoid it.