When it comes to things I don't like, I have a pretty weird mix, mostly of incredibly common things. I dislike the taste AND texture of celery. Heck, even the smell of it just overwhelms my senses. I can't handle eating tomatoes raw unless they're chopped up really finely (as in pico de gallo) or sliced and put into something, like a burger. I can't stand mayonnaise, but I can somehow easily stomach aioli. Also don't like most salad dressings, especially ranch; I'd rather just have my salad plain. I won't go near yellow mustard, but I like just about any other kind of mustard. When it comes to fruit, I don't really like grapefruit, watermelon, or honeydew, yet I LOVE the rarely-liked cantaloupe.
I also can't stomach jalapenos. At all. It's not even the spiciness that gets to me, it's the actual flavor. Tastes like crap. Mushrooms and olives are on a case-by-case basis for me. So long as they don't overpower my palette, they're fine, but otherwise, eugh.
So yeah... I think that's it.