People are mean and jerks are everywhere. Perhaps somehow society has convinced us otherwise, but there are a lot of terrible people out there.
A lot of people do evil things, a lot of people hurt other people. This is not new and it's not a secret, people for whatever reason are more oblivious to it than they should be or perhaps people are so accepting of inappropriate behavior in our entertainment mediums that we are desensitized to it until it happens to us. I really don't know for sure.
What I do know is not everybody deserves a say in everything. Sometimes people are wrong, or are trolling, or just have no place in the conversation. The right thing to do is to remove those people from the conversation if they aren't being constructive.