There's lots of journalism about this and lots of movements and way too many anecdotes to try to say it's just this or it's just that. It's not only in game stores it's not only in call of duty or halo matches it bleeds everywhere. One of the things that bugs me the most is how guys in conventions of stores will quiz girls that express an interest in video games or role playing our card battles. Trying to get them to prove they aren't just pretending to like things to get nerdy guys to fawn over them. And I know I've heard stories from members here as well so it's not just in click bait articles or echo chamber reddit threads. I've never personally seen it but I won't deny it likely exists. And it is very sexist and very ingrained in gaming in a lot of places. As for why. I too presume it's embittered virgins lashing out at awesome girls they can't have or some such nonsense