I really try quite hard to never feel bad about any music I listen to. I enjoy whatever, I'm not self-conscious about it, really. But if I had to pick the ones that other people might judge me for, I'd pick out the following.
Avenged Sevenfold
Paramore
Foo Fighters
blink-182
And I used to listen to Three Days Grace and Avril Lavigne when I was like 13.