I'm a gril, so wut?
But seriously, this issue has never been black or white. Yeah, being a girl in a male-dominated hobby sucks sometimes, but at some point, you have to get with the teasing and dish it back. That's how I do it, bruh. And let's be honest, hanging out with dudes is really fun. I know that it's different online, it's 100x worse, and especially once you get a bit of traction and the spotlight on you, then you get all kinds of shitty comments.
15 is young to go through this, I hope she has friends that support her. But she also has to learn to either not read all comments or just brush them off. Cause who cares what some sweaty, Cheetos-eating drungo says about you? Do your thing and ignore that shit. Body his ass into the 5th salt dimension. Make him break his controller, hell make him break his console, it's all for the better anyways.
If you wanna run with the guys, you have to learn to not pull punches even if it's in our nature to be more passive. If you don't adapt, you'll get bodied, same as in FGs.
TL;DR: don't get RL bodied by Cheetos-eating drongos