Sure, there are people who do that, but most women tend to not behave that way (in my experience anyway). My guild in WoW didn't know that I was a girl until almost a year after I started playing when I finally got around to buying a working headset, and as soon as I spoke in vent, sure enough, the banter began. Of course, I don't really care as much as other people do because I'm pretty light-hearted as it is, but it's hardly an anonymous setting.