Artists/bands I can’t stand but have huge followings:
Rush
The Cure
Radiohead
Emerson, Lake and Palmer
U2
The Smiths
It’s cool to hate Nickelback, Creed, etc., so I don’t bother anymore. But I actually own an album by each of the above bands, and while I may even like a few songs by those artists, by-and-large I find them obnoxious and their fans often even more so.
But I think The Cure and Radiohead are the worst. Pretentious and droning with terrible, terrible vocals. I’ve got both OK Computer and Pornography and could only manage to sit through each once.