I couldn't hate anyone I didn't know, so heres a good little lest of the ones I don't care for:

Orange Range
B'z
Mr. Children
Kinki Kids
Anyone else with a weird name that makes them sound like a Pedo
BoA
BoA
BoA
BoA
BoA
um..
BoA

And I really can't stand Mika Nakashima's personality (her musics ok) She just seems like a stuck up *beep* to me