I think if I'd been asked this question when I was much, much younger the list would have been exceptionally long and would've included many of the foods already mentioned in this thread.
Now, however, as I get older there are fewer and fewer things I don't like. Can't really say I actually "hate" anything either. Actively dislike, maybe.
I would have to think long and hard to come up with anything. Brussels sprouts are among my least favorite foods but, I will eat them to be courteous if they're served if I am a guest. Well, maybe not eat all of them. Just enough to be nice.
Don't care for anything overdone. My mother was the queen of "shinglizing" a good steak. I learned from my father the pleasure of a barely moo-removed steak. I'm guilty of "checking" the stew beef before I brown it. I remember reading
Rosemary's Baby and relating to a scene in which she eats raw beef.
Not wild about caraway seeds. More the texture than the flavor. We had Hungarian pork goulash last night for supper, which called for caraway seeds. I wanted to keep the recipe authentic and didn't want to leave the caraway seeds out, so I put a little less than called for in one of my metal mesh tea balls and inserted that in the pot. Worked like a charm. The goulash was infused with the caraway flavor and I didn't have to pick out seeds.
Still trying to incorporate fennel, in all forms, into more dishes. Use fennel seeds all the time in Italian, but I want to do more with fresh fennel bulbs/fronds.
Until a few years ago I couldn't/wouldn't go near asparagus. Now I really like it. Don't know what happened. The "like it" switch just came on. I've discovered that with quite a few foods.
Anyhoo, that's my story and I'm stickin' to it