ah, finally a topic about hatred!
(in no particular order)
Macy Gray
Eminem
any American Idols
Nelly
Dido
Aerosmith
any manufactured group (by definition)
pretty much all hair rock, gangsta rap, and boy bands
almost everything that gets radio play
NOTE: I will prolly be adding to this list periodically...
for the record I like techno if it is original and innovative (and sounds cool)