I honestly believe that a depressingly large segment of the gaming population is still struggling psychologically with having been ostracized/bullied in their developmental years, and this sort of vehemence is nothing more than lashing out at the ghosts of their pasts.
They set themselves up as opposed to something, and then rail against it, because it alleviates the issues of helplessness and ineffectuality that they struggled with when they were growing up. It gives them a sense of identity, and more importantly, allows them to dish out some of what they had to endure themselves.