Eh, not exactly. Even when asked questions pertaining to being a female w/in league discussion forums, wherein it is relevant to announce your own sex, I still see and have gotten the "why did you say you're a girl" treatment. Yea, there are females or guys pretending to be females that get their kicks from announcing a female sex and then recieving special attention, but the hatred of that act spills onto accidental, absentminded, reasonable, or inevitable instances of revealed sex. To be honest, its worse in the league community than in other games I've played. I've always hidden my sex, but in more personal guild environments of MMO's, people interact like friend groups and sex becomes a non-issue. I just didn't like people going easy on me in PvP, which happens sometimes if you're female.
Whereas, In league, you can get attacked for just sounding cute. I've seen enough from the example of the hatred Lilypichu gets. She's the farthest you can get from a titty streamer, but people still direct that titty-boiled hatred at her because their voice-boners won't(or will?) stand for such indecency. There's just a degree of extra scrutiny that get's applied when the can of female worms is opened, and I'd rather not open that. Thus, I will not use voice chat. In the gaming world in general, I never thought of sexism as really being an issue. I hardly experienced it. It's really just league that's like this. Girls are the ass-end of a lot of jokes here, and there's some sort of anti-girl hypervigilance in some people; where you have to hunt for imaginary female sins, otherwise you're a "white knight". As far as I've seen in other games, it's not an issue. It's literally only here, out of all the games I've been on. No surprise either, toxic community.