I've been to a number of conventions. I've never seen poor behavior and have always felt a sense of camaraderie among the other congoers. We're all a bunch of nerds who came together for a weekend to be as nerdy as we want to be. In terms of women attending cons, I didn't see anyone give them any grief. It may have been simply that I didn't see anything beyond the groups I was with, but the cons I've been to have had a friendly and welcoming atmosphere. Plenty of female cosplayers and crossplayers, and dare I say even more than male, at least at anime conventions.