Okay, great. Congratulations. You play games and watch anime to relax from busting your butt. So do I. Except, you don't have to deal with the sexism. For you, the most annoying thing is the complaining. For me, nothing ruins a lovely session of relieving stress and venting frustration at the expense of the lives of some pixels quite like sexist comments. Or getting hit on in what can sometimes be incredibly creepy ways. Being told by random strangers that you're hot, or sexy, or that you should get married, is not an enjoyable experience. Being called a dumb b**** is also not fun. And being told to get in the kitchen and to go make a sandwich is only funny when it's said by a close friend who knows that I know that they're joking (they also know that if I go to the kitchen to make a sandwich, it's so I can eat it in front of them with a smile on my face).
Furthermore? You've probably never had to worry about going to your local game shop alone for fear of being hit on by the guys that frequent the place. Trust me, I'd love to be able to go to my local shop on my own, but the stories I've heard from my friends of their experiences, alone, are enough to keep me from ever feeling comfortable doing so.
If it bothers you that much I know of all sorts of online gamer girl only guilds like the FPMS club I think its called. I myself haven't been a group that says those kinds of things to women. Mostly it's the oppoiste with them yelling at us for whatever we said or how we are playing. But like i've done and think most should do is just if it keeps bad enough, just pull out your mike and mute everyone. problem solved.