OK, I admit, I don't even know any gamers. Gamer magazines would probably be the place to look to see what'll get them riled up. A general impression that XBox is UnKool (or however that's spelled these days) and that anyone who has one is by definition a dweeb is probably as specific as you want to get (or has dweeb joined nerd and geek as a token of high respect?).

I don't see how this could be done effectively from the outside, but if some well known in gaming circles could be recruited to spread the FUD . . .