I saw one of Anita Sarkeesian's videos in my recommended and I said "fuck it" and gave it a good faith watch. I may not agree with, or understand every single point, but I remember that she got DEMONIZED for making this. I was told that she hated men, that she wanted all these sexist roles inverted to be in women's favor, and that she was some authoritarian fun police (ironically said by the ringleaders of the satanic panic).
She said some things, and people thought some of what she said was wrong. Even I did. For example, she mentioned Betty from Rugrats as an example of a "straw feminist", but she was portrayed in a sympathetic light and was not meant to imply "feminism bad". Yes, she's androgynous and she's a lesbian, but she's handled pretty well as a character. I'd hardly consider Tracer a straw feminist (I would at least assume she considers herself one since she found Mondatta "an inspiration growing up).
I know that this was just ONE video, but from the information I have, it seems like this whole thing was blown WAY out of proportion. So what gives? Why Anita in particular? Also, how did this whole gamergate thing grow into being rightoid woodstock?
this video, which pre-dates GG, explains it pretty well. I can't properly say why their reaction was so vitriolic, but I think it became such a big deal because she spoke out about it, which pissed them off even more.
Dan Olson did a good video on GG as well, which I'd recommend watching.