I hated walnuts baked into things. I still avoid them but they really aren't that bad. Not that good either. Then there is squash, egg plant, hot peppers, most cheeses, most fish, beer, wine and I'm embarrassed to say, most things "farm fresh" were suspected to be gross. Now, those things are at the top of my list
How about in reverse? Foods you detest now that you liked as a kid? American cheese, Miracle Whip, Captain Crunch, Soda, Twinkies, Wonderbread, Cola, margarine, I'm sure there are more.
I'm starting to understand why my son has food issues, he is like I was.