I have two from different points in my life. The first was as a child in the fifties and sixties when my mom, who had been taught to boil vegetables to death, made spinach. Ever seen boiled-to-death spinach with those long trailing stems? Yeah, it doesn't get any better when it gets cold and that's how it would always end up because I had to stay at the table until I ate it--which I never did. I would stay there for hours when it was time to go to bed. And o this day I cannot see or be around any cooked spinach, or any other cooked leafy green, without automatically feeling my stomach begin to heave. (Better have a bathroom nearby because I will need it very soon.) I can't even eat it if it is hidden by, say, blending it into a smooth soup or smoothie with fruit. I can eat it if it is only the leaf, not the stem, raw in a salad but it better have other leafy greens with it.
Second, on a trip to Tahiti I was invited to a real luau, not one for tourists. Poi was served. I tried it and my automatic reaction was a face that showed how truly awful I thought it tasted (and probably an accompanying gag. I did swallow that bit but I am sorry to say I also probably insulted our hosts. I didn't mean to but, really, that stuff is vile, truly an acquired taste, likely acquired only by growing up eating it.