Well, you'd figure that a belief that people hold so vehemently would have some evidence behind it. I really haven't seen any. But I guess it's accepted to hold a belief without evidence if it conforms to group norms. Snide comment or not, this group of unusually smart people is not so different from other groups that are held in low esteem by it. It's funny how that happens.
It's interesting, and telling, that several hundred smart people have viewed this comment, but not one of them has decided to offer a link to any sort of evidence.