We still use the term "nerd?" I thought we were in at least high school by now.
Oh, and World of Warcraft and RuneScape are just as bad as Call of Duty or even any other game when it comes to their fanbases. All have either annoying little kids, piece of shit teenagers, or obese adults playing them. Sometimes all three and more. (And there are even more generalities than that, they're just the most outstanding.)
And honestly, Call of Duty has a lot more players than WoW and RuneScape combined, as well as douchebags who take it too seriously. If there's any "nerdy", or pathetic fanbase out there, it's Call of Duty's.