i've deadlifted to some rap before (some of the harder stuff can be good)... the shittiest shit they play at my gym is good charlotte and such... man it pisses me off.
definitely any "alterna-rock my daddy din't give me enough attention as a child so I am going to pierce myself and dye my hair blue to be different even though that has become the norm now so I am not different even though I try and that just feeds my bullshit teenage angst" type of music.