Are you saying this anecdotally or do you have data to back this up?
"Findings indicate that, on average, the female voice received three times as many negative comments as the male voice or no voice. In addition, the female voice received more queries and more messages from other gamers than the male voice or no voice."
Anecdotally, the gaming communities that I've been a part of that have had more representation of women have been much more pleasant.
Not as academic as I'm sure we'd both like, but there's not a lot of funding for studies that deal with online harassment.