Personally, I would consider the larger problem is folks who pretend to have passion for something they don't care about, male or female.
A comicbook movie director telling me he doesn't care about the comic books (ie Tim Burton), or has never read them (ie Bret Ratner) gets as much distrust as someone who says they never cared for gaming, but it was the only way for them to use their writing talents (such as some of the writers for BW, although the over-reactions there were by no means justified).
Nerds have been getting crapped upon for a while, so I suppose the "bro-dudes" and "babes" could be galling to a subculture who were previously derided by these figures.
Not saying that it's fair to react in the way certain gamers have been. It seems like I'm arguing this same point every day. In general, most of the fans are alright. It's a few of the crazies that ruin it for the rest of us; it doesn't matter what fandom (comics, games, movies, etc).
Heck, look at all the crap JK Rowling got over some of her choices in writing. I can't say I cared for the last Harry Potter book, but it's her own darn story, and it isn't like she ended the story on some nebulous cliffhanger.
I just seem to be getting this feeling of misplaced righteous indignation coming from all sides, whether it be folks reporting on the heinous acts of a cross section of individuals, or said individuals who somehow feel justified in their actions.
I prefer to say the anonymity of the internet remove all filters, and those of us who aren't as mature (regardless of age) are ill equipped to behave properly in such an environment. However, this behavior has always been there, the internet just makes it easier for all to see.
For example: a few anime/manga creators I enjoy got death threats over their works, well before the age of the internet became prevalent. This was a small cross-section, but a frightening one nonetheless. Now, under those circumstances, a restraining order or other punitive measure would not be unheard of.
We have no similar recourse online. While I consider the case of the facebook post of that LoL player to be extreme, some form of ban, suspension, fine, or warning should be warranted in cases where people legitimately threaten the safety of other people.