These people cannot handle it when someone they like (as a person, their creative content, etc) turns out to have different opinions than them. Part of maturing into an adult is realizing that, sometimes, people you like and respect can also hold opinions that you don't agree with, and that doesn't have to diminish what you admire about them. And on the other hand, people you dislike and often disagree with can have valid points, too.
But oh no, it turns out that Jontron isn't rabidly pro-choice and said some good things about Trump, CLEARLY THIS MEANS HE'S A NECKBEARDED NAZI FASCIST WHO NEEDS TO BE BOYCOTTED. How do these people even manage to be functional members of society? Oh wait, they don't.