As a nerd one gets to know a lot of nerd subculture effluvia that ain't your preferred flavor. Writing about Star Trek got me thinking about other all the flavors of nerdery with which I'm familiar, despite not liking the stuff. Here's an off-the-top-of-my-head list:
Furry (aka yiffy, aka cartoon animal fetish)
Barbarian art (Frank Frazetta and his imitators)
Filk songs (aka "folk" songs about Doctor Who or whatever)
Fanfiction, fan art...
Collecting figurines/statuettes/action figures of favorite imaginary characters
Online gaming (Or PBM, play by mail games, for that matter).
Making little movies with images and code ganked from electronic games
Phew! I'm sure I'll think of more. I'm not judging; I'm a big nerd, so who am I to sneer at other nerds? But these things are like Paris Hilton. I don't care about Paris Hilton. I never will. So why do I know about Paris Hilton? Why is this stuff in my head?
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This editorial by Carol Strickland does a good job of explaining why beauty in art doesn't always mean pretty.