I think you meant to say "Some Women" because otherwise, well, you're saying that all women think it's ok to be sexist - which ironically is in itself clearly sexist.
So I ask you: Why do YOU think it's ok for YOU to be sexist? (It's never ok to be sexist no matter what sex you are.)
It might also be instructive to read this: http://www.bbc.co.uk/news/magazine-18280000
I note that they are talking there about FP shooters. It seems to me that MMO players are far less sexist in general. Not sure why.