Any pop singer including Lady Gaga, Rihanna, etc. You know people who don't make their own music. And I hate most rap...so most rappers.
I hate country too but I don't hate many country singers. The only one I can think of is the Dixie Chicks.
There aren't too many rockbands that I can truly say I hate but I do hate Kiss, Smashing Pumpkins, Tool, Marilyn Mason, Coldplay, The Eagles, The Grateful Dead and maybe a few others I can't think of.
all Disney stars
My chemical romance
and it`s not all.