I would have to say anti-social.
My mates are just typical gamers and only really like famous FPS's with gore and violence, e.g. Call of Duty, Halo, GEARS, GRAW, Left for Dead, Quake etc.. Im not saying i don't like these games.
But I tend to also play games that my mates absolutly hate, e.g. Wik Fable of Souls, Blue Dragon, Samurai Warriors 2, Enchanted Arms, Lost Odyssey, Boom Boom Rocket, Luxor 2, Hexic, Kengo Zero, Rag Doll Kung Fu, NPPL 2009, Outpost Kaloki, Etc etc. So I usually play games on my own.
Thats why i'm an anti-social gamer. =]