Why do people hate music they don't even listen to?

I'm a very open person and I have friends of all colors. Some of them think like me and love music as long as it's good. On the other hand...a lot of my white friends hate rap music just because they dislike something they heard on the radio and can't appreciate the culture. Same with my black friends because they assume rock is devil worship and screaming when in reality both of the sides are wrong. I actually heard someone play a song by All American Rejects and the song was called "devil music" by one of my white friends. I don't know if I was just born with more of an open ear but AAR of all bands was called satanic by one of my friends.

Are we destined to stay divided as two different cultures until we can appreciate something we may not be used to? I'm truly confused because all music takes skill that's why it makes me mad when white people say 'rap takes no skill' and black people say 'rock is just screaming'. So why do people judge something at face value especially music which isn't made for a demographic. Music is made for people.

Should I just distance myself from both groups considering I can't seem to get along with either?