People tend to be outwardly mean and terrible. They take things that they hate, whether they hate them because they're different, strange, or because it's just easy to hate them, and they do things that otherwise they wouldn't do to make them feel terrible. The internet is the worst place for this, as you can pretty much do whatever you want and nobody will know that it was you who did it.
Everybody has something they hate for no reason. I myself hate patriots, religious freaks, and vegetarians. Everybody is entitled to be able to dislike certain things, it's what makes humans humans. Nobody can love everything and everybody.
As for this situation in general, tolerance is probably the best thing you can have. Tolerate that there are and forever will be assholes on the internet, and move on.