Like everyone else, I can't stand rap or country. There are a couple good rap songs I like, usually if they have a good beat, don't have the generic gangster lifestyle lyrics, and incorporate things like orchestras alongside the beats. But for the most part, it's just embarassing to listen to most rap songs nowadays.
Also don't like metal, heavy metal, or even death metal. Just can't stand the constant onslaught of guitar and yelling, etc. There are 1 or two metal songs I like, because they're instrumental (no vocals) and hit the perfect tone of evil.
I know everyone will find me crazy for saying this, but I love 80's pop. I love the cheesy synthesizer instruments, and the drums. They're seriously awesome.