I didn't know WoW was seen as nerdy. As someone else said, WoW is like the CoD of MMOs. In fact, the only people I can think of who would actually think someone is nerdy for playing WoW are the Fragheads who are so insecure that they feel the need to be over the top macho. Fun thing to do if you play both FPS (and are good) and WoW. When someone starts raging over the mic about you headshotting them or getting a killing spree, tell them you thought you were healing them like you do in WoW.
I have never heard people rage harder when I've said that.
I struck up a few WoW conversations in some CoD matches after reading your post, just to hear the hilarious reactions... Instead I got mostly people that ignored me, said they used to play it, or people that didn't know what it was. Maybe I was lucky, but there was this one guy though that seemed very angry for no real reason and said it was a game for pus****, lol.
I have the PC version of CoD however, so the community is much more level headed then its platform counterparts. Otherwise I probably wouldn't have never gotten the chance to speak over everyone's rage of the "hacker scrub" or "akimbo noob."