Fellow female overwatch and video games fan here .
Unlike you, I've had a shitty time at school, I was bullied for the most part (will spare you the details) so I've had a very different experience of rude online comments. I've started playing with strangers online with overwatch when it came out and I've noticed that yes, as cliche as it sounds, sexist comments or just surprised reactions or interested friend invites ARE a thing.
It didn't surprise me but it didn't hurt me either. Nothing of what these strangers on the internet can say can reach me. Most of the time they're just little kids trying to act tough, desperate guys, sometimes genuinely nice, desiring to find a gf who will understand them, or just people that are rude in general and jump onto an easy occation to be bothersome. For me, online comments like those I've received are NOTHING compared to real life harrassment. Ultimately, these people can't do shit to you and allowing yourself to be influenced by it isn't right. You can't make the world smarter (unfortunately though I believe in time this vision of the gamer girl will change) but you can make yourself stronger.
Thanks to overwatch, I've been treated in a sexist way for the first time but I've also made a few very good friends I'm hoping to meet irl one day.
If anyone here's interested in playing overwatch pc (plat level) and is tired of stupid players and interested in meeting nice, funny, a bit crazy people, add me (discord : lezmagi#0635) and I'll add you to my team. I promise you fun ^^