Now now. Granted, they're over-rated, and you may not like them, but if I were you, I wouldn't go off saying they "suck", I would probably say I didn't like them. There is a huge difference. Since musical taste is subjective, unless everyone in the world does not like them, they don't suck. Now, I love Fall Out Boy. And that's an opinion. But there are bands that I don't like, (take My Chemical Romance, for example), but I never say they suck. I just don't like them. It's not my style of music. But "My Chemical Romance sucks", or "Fall Out Boy sucks" isn't true, and other than that, it's distactful.
Crap. That has nothing to do with emo, I just had to let that out. Sorry.