I'm friends with a guy who worships Lil' Wayne and thinks he's the best. I've got a friend whose a hardcore Justin Beiber fan, I've got friends who love the Beatles, one who only listens to classical music and then there's my sister who only listens to the Quran and nasheeds
It's all very subjective and I can't objectively say that anyone has bad taste in music because they probably define "good music" by a different criteria. One person could be all about the lyrics, another could be more into the beat, and so on.
I've moved onto grunge rock but honestly the only time I liked people like lil wayne and whatnot was when I didn't know anything about music.
Right now some bands I like are Godsmack, Three Doors Down, Breaking Benjamin. Need to start listening to the Beetles and more older rock bands.
I don't like rap anymore because most current rappers like lil Wayne are all shit.