I mean, what happened that made people hate him so much? Also, why'd he leave Game Grumps? My sister says it's because his fans over at his channel got pissed off that he wasn't making videos that much outside of Game Grumps but I feel like there was something else wrong...
Oh, shit happened on twitter and all the SJWs claimed him to be the worst thing ever in the history of everything.
Also from what I've learnt, he left Game Grumps because he was moving to New York to be with his girlfriend (Nicole) and by moving he was able to focus on JonTron episodes and kill two birds with one stone.
People always think there's something else that happened, and be debate and speculate, but Jon has stated that he's not legally allowed to talk about it, due to the Game Grumps being with Polaris and it being all legal issues and that...He's stated he wants to talk about it, but he's not allowed to. The Grumps themselves just want to move on, so that's what we all should doing.
Jon's got his own channel, Arin, Danny, Ross, Suzy, and Barry have the Game Grumps channel and their own channels; so let's just enjoy them for how they are.