Okay well first of all, I was being hyperbolic for the sake of humor. I could've responded to it in a more serious, academic manner, but I was tired.
Second, never did I say that it was all fans. Nor did I say that GameFAQs users represent all fans. There are fans of everything which ruin a fandom. For example, I love RuPaul's Drag Race, but there are a lot of nutcases on Twitter who will send death threats to the queens on the show over the pettiest, stupidest things. I love Rick and Morty, but when I say as much, the default is people won't think I like sci-fi and nihilism, they'll think I'd throw a tantrum in a McDonald's over Szechuan sauce. I love My Little Pony, but in turn, that conjures images of a neckbeard who masturbates to plastic horses instead of a cartoon enthusiast who enjoys friendship and magic. Any fan group is defined by its worst eggs; you can fight against that perception, and it's good to do so, but not acknowledging the problem doesn't mean it's not there.
In terms of geekery at large, there is still no better example than Ghostbusters 2016. The collective amount of outrage simply because it starred four women was absurd. I'm not even talking about post-release, when people had a chance to judge the film on its own merits; I'm talking about the day one vitriol that got so bad Leslie Jones was bullied off Twitter. Now, am I saying that Ghostbusters 2016 critics are all misogynist? No. However, to say that a significant, perhaps even majority subset of the critics were not driven by misogyny is ridiculous. You want to go back even further to something specific to Nintendo, remember Spyborgs? It was announced as a Saturday morning cartoon-styled brawler, and fanboys lost. their. shit. This resulted in the game getting rebooted, losing its personality, and coming out as a thoroughly mediocre game. Were those people representative of everyone? Well, at the end of the day... did it matter?
My point is that more often than not, a lot of criticism online is made in bad faith and usually driven by some manner of personal, often malicious bias. As such, when people respond to those bad faith criticisms with defenses like "fans are toxic" or "you hate women," it's often because, even if it's not everybody, it's still, on some measure, true.
Oh, and for the record, in terms of the Sonic movie specifically, I don't think these arguments were in bad faith. They were certainly amplified due to its proximity to Detective Pikachu, which did it so, so right compared to Sonic's so, so wrong, but in this instance the outrage was more justified than now.