Years ago, JO established her online victim narrative by intentionally provoking notoriously unstable fandoms (particularly bronies) and crying foul when they responded. It was fun at first when she mocked the dreadful RWBY, but after months of going into how idiotic anyone who likes the show must be and crying over their cruel treatment of her, it became pathetic that she had to prove her intellectual superiority by denouncing obvious incompetence.
I don't have a major issue with the fandom provocation itself, though I find it tedious, but the cries of harassment at anyone responding took away all the cool edge she may have had with the practice. Moreover, when Devin Faraci went on a tirade expressing his hatred for anime and it's fans, she became indignant and responded with the nobility of anime until he blocked her (exactly the behavior she would later use to show the undiluted evil of Gamergate), showing that while she could dish the fandom mockery out, she had quite the thin skin when it was applied to herself.
The best part of the Devin Faraci incident was how she took away his male feminist card for his hatred of anime (this was before it was revealed that 15 years ago, while blackout drunk, he groped a woman). Faraci claimed anime was sexist, JO responded that it could be feminist, which he ignored, which she took as proof of his sexism because he didn't listen to a woman's opinions on the issue, making him a Fake Feminist. 'Listen and Believe' was only Sarkeesian's invention in the phrasing- the idea was already established in feminist circles. It was an early lesson in the way Feminist status was largely arbitrary and based on personal grudges.
Also, this reinvention of herself as an activist is rich, since a few years ago she would brag about her indifference to politics. She allowed the SJW beliefs to osmose into her- don't buy this persona. Her politics came from watching people getting yelled at on the internet and figuring out which opinions would allow her to avoid that fate.