I'm surprised how many on this list I agree with. It's not that I dislike them, in most cases, it's just that I don't see the point, and don't get how other people can be soooooo enthusiastic.
Hoppy beer, "smart" TV shows, Doctor Who, fantasy, Beatles/Stones, "edgy" (=violent) films, Celtic music. And I get the same responses: "Oh, you just haven't tried the good stuff" or "you should give it another try." I get it. You love it. You find it hard to believe I don't. Trust me. I don't.
One I haven't seen so far: sushi. I don't dislike it. I'll even eat it. I just don't see the appeal. It's white rice with salt and sugar and vinegar and a little bit of something else. Its flavour and nutritional profile is that of a relish sandwich on white bread.