If I Can't Squee, It's Not My Comic-Con: a blog entry from August 2009 which touches on some of the gender and age snobbery in fandom.
Fan-What? "In theory, Fanboy and Fangirl are simply gendered terms to differentiate a male fan and a female fan. In practical use, they have not only a different gender but an entirely different meaning."
ETA:
When Worlds Collide: Fandom and Male Privilege