People try to relate music taste and intelligence so they can feel superior but there's really nothing to it other than the natural tendency of the brain to rationlise its experiences. The experience of a song is totally subjective and heavily influenced by culture and personal experiences, so what you listen to has much more to do with that than smarts.
You can talk about more complex music being more theoretically challenging or requiring more skill to create, but that doesn't make the act of listening any more demanding. Greater appreciation of a complex song could require greater knowledge of the musical traditions being followed/challenged by the song, an understanding of the creators social context, or an understanding of the technical ability of the creator. But,
1: None of these things needs a brain with lots of logical ability
2: None of these things guarantee that you'll actually like the music.
3: They're not at all necessary to like the music.
A totally fucked up song that requires a lifetime of theoretical knowledge to fully understand can be enjoyed by someone who has never played an instrument and has zero theoretical understanding; as long as it sounds good to their ears that's enough.
Rap gets a lot of unjustified hate. I'm not saying that all of it is racism (obviously it's not), if you don't like it then that's fine. But definitely some of it is just racists wanting to feel superior by discrediting black culture. Pop is another common target of contrarians with a chip on their shoulder.
The only real superior stance is to try to enjoy as many genres/traditions as possible, all you'll end up doing is enlarging how many pleasurable experiences you get to have in your life.
https://www.youtube.com/watch?v=qWG2dsXV5HIhttps://www.youtube.com/watch?v=GlhV-OKHecIhttps://www.youtube.com/watch?v=Oy5yFowc2Ckhttps://www.youtube.com/watch?v=TFr4br_GrSchttps://www.youtube.com/watch?v=lS-af9Q-zvQhttps://www.youtube.com/watch?v=sRmIiUPI6c8 
