I haven't played much PvP on XBox so I haven't really encountered it yet, I do know on MMO's there can be massive amounts of chauvinistic behavior exhibited by the men.
There is a common assumption that all women are terrible at gaming and were somehow dragged there by someone else. Also the assumption that all women that play MMO RPG's should be tucked in a corner on a healing class.
I am guilty of pushing the limits in every attempt to prove how wrong they are...
