Well, absolute outrage is not absolute. This isn't something that's accurately metered. As with everything in outrage culture, the media tells us the outrage is palpable and we simply accept it. Users voicing their displeasure on reddit / twitter / youtube in any capacity is all it takes for the rags to twist this into an apocalyptic, mouth-frothing rage machine. It's a complete joke. The barrier to typing a few words for the world to see is paper thin. Displeasure isn't rage.
It's easy to manipulate discourse this way because anything can be construed as utter outrage.
What is unique in gaming is the feedback loop that happens. First the media responds by saying the guy is an asshole. Then the gamers respond with more vitriol. Then there is "Everyone hating the mobile diablo is a misogynist" kind of tweets. Rinse and repeat.
Do note I'm not justifying it. Merely trying to reason about why especially in gaming these outrages escalate into insane heights instead of dying in meh after a day or two.
We have been seeing this kind of vicious circle elsewhere too lately. As an example the latest Star Wars film where it ended up so bad that if you didn't like the film you were a Russian troll.