I like a lot of bands that would be considered bad. True, it's only one or two songs, generally, but why are you ashamed? If you enjoy a song and someone else doesn't, it's called an opinion. I always think of Daniel Tosh when people start having arguments over my tastes in music.
"Dave Matthews Band sucks! If that offends any of you, then you are the problem with America because someone had a difference of opinion and you felt personally attacked instead of concentrating on the real problem: why do you listen to shitty music?"