I think because a lot of guys are in their parents basements still they're not too sure how to react. Some act pathetic while others give them shit. It sucks. I recall when girls started playing games online. It was back in the Halo 2 era. People have and still give girls shit today online, but it was even worse in the Halo 2 era. How worse you ask? Imagine playing a game of free for all and there is 1 girl in there. Wanna know what everyone else did? They all went up to her player model and started tea-bagging on the ground. Every single one. They would not leave her alone, get out of the way or even play the game normally. I think there is a video of that floating around on YouTube somewhere, but I'm not sure if it still exists or not.