Why cant anybody get along?

Why is everybody hating on each other so much just because of what they listen to? Its ok to have your own opinion but you dont have to disrespect people just because they like rap or rock or country or whatever else. You could say rap sucks or rock sucks but if you think about it all music sucks in its own way. Dont you think that you should be open to all kinds of music? The world would be boring if there was only one type of music. Tell me who your fav artists are in every genre. I like George Strait, Korn, and Jay-Z.