Just all at once I'm gonna say most, if not all, Decaydance/FBR bands. They just...no. A lot of the music sounds similar to me.
I also despise Justin Bieber, that poor kid has no talent imo.
Bring Me The Horizon, and just about every other incoherently screaming band, annoys the crap out of me. I mean, if it just sounds like a trainwreck, I don't want to hear it. I don't think I should have to read lyrics online to decipher my own language. -shrug-
And then also Owl City, 3Oh!3, and all Disney singers. I mean, I can be changed on all of these things except Disney, I don't really
hate anything, I just haven't found anything by them I like. But I'm pretty much open to most other things.
Edit:
Omg, so many people dislike Tokio Hotel. I don't know if I'm sad or amused.