Your citing of the nerd/jock dichotomy is an excellent point (it's starting to become the fandom-specific version of the virgin/whore dichotomy), but I think you're also dealing with the magnifier of the fact that fandoms of all stripes are now living in a post-Adrian Monk and Greg House world, in which intelligence itself is at once regarded as a sort of handicap in its own right and as a carte blanche license to act like a dick toward everyone around you.

Which, perhaps not coincidentally, is how many "self-diganosed" Asberger's sufferers on the Internet see their own supposed condition.