You know what I don't like in my music? Autotune. So brave, I know. It just sounds so bad, though, when a singer's voice gets transmuted into a robotic whirring. I mean, it's pretty harmless if a competent sound-mixer-person is using it to touch up a couple notes for the recording, but when singers have to go all T-Pain because they can't sing the notes for real, that makes me die a little inside.
I'm also not a fan of the screamy stuff you get in heavy metal subgenres. It's really grating, and it doesn't sound anything like music to me. If you're a singer, your job is to sing. It's bad enough when you're a bad singer like Rex Harrison and you speak the lyrics instead of singing them--if you scream them, it's like, not only are you bad at singing (or, if you're not bad at singing, then killing your vocal chords so you will be in a few years), but you're actively making it as painful as possible for the listener.
Oh, and Korn. I don't like Korn.
I know there are a lot of people who are like, "Oh, yeah, I don't like rap," or "I'll listen to anything except country." I don't really feel that way. I mean, for starters, I don't really listen to rap, but it's not like I dislike it (well, excepting the autotune stuff). And what's wrong with country? I like country. Country's fine. They've got good vocal harmonies and, like, strings and stuff.
And Justin Bieber... seriously, guys? I mean, you might not personally like his stuff, but the vitriol I see directed at this kid just baffles me. I've heard him on the radio and as far as I can tell, it's pretty standard pop schlock--but his popularity is solid proof that he's doing something right, even if it's targeted to a narrow demographic.
Anyway, my point here is that everyone else should stop hating things I don't hate, and start hating the same things as me instead.