I'm curious which cons you had really bad experiences with.

(As a fellow female geek, I have always felt very safe at GenCon and haven't had any problems at Origins or at Geekkon, in my home town. When I occasionally encountered a poorly behaved individual the rest of the folks around me were just as horrified by their behavior as I was. I'm definitely not trying to deny the validity of your experiences; I'm just curious why mine differ so much.)