My classic answer to this would be mushrooms. Hated them almost every where. The only exception was if they were pan-fried the way my mother used to when she made steak. Cooked down to little chewy, savory nubs to mix with a little A1 sauce. Well, and stuffed mushroom caps, but that was more “I’ll deal with the mushroom to get the stuffing.”
But my tastes really changed, and I like mushrooms a lot now. I still find really low-quality or canned mushrooms revolting, but otherwise.
Supermarket tomatoes are pretty meh - but tomatoes fresh from my garden are awesome. Have you had any real tomatoes as opposed to Sears tomatoes? Might change your mind.
I fell for that once. Once.
I am another “tomato hater.” I can’t fathom how some folks find them edible. One of the most horrible so-called “foods” on the planet. When I was a teen, my Dad encouraged me to try a fresh tomato from his garden. He was proud of his garden and had some fresh red tomatoes. Trusting my Dad, I tried one. 10 seconds later I was in the bathroom, hugging the toilet. My Dad tried to poison me. 
Shrimp only from a Japanese Hibachi Grill place. I only ate it because it was part of the dinner and had already paid for it; I would have never tried them otherwise. I then tried shrimp at some other restaurant, thinking I had just been avoiding them for no good reason, and it was as vile as I had originally imagined… However they cook them at Hibachi places removes all the seafood nastiness.
On a similar note, the only time I’ll generally eat mushrooms is when they’re fresh off the hibachi grill having been cooked with my steak. And I mean fresh off the grill. If I don’t eat them within a minute of them going on my plate, I won’t like them.
Carrots are fine. Raw cooked or whatever. Love 'em in stews. But who thought up carrot cake? I know they’re sweet, but keep vegetables out of my cake please. It’s just wrong. (Don’t like zucchini bread or other vegetable ‘breads’ either).
Green beans must be from a can for me. Has a certain flavor I love. Fresh green beans? Meh.
Corn must be fresh and on the cob for a side dish. Canned corn is meh. The opposite of green beans.
Are you sure? I ask because lots of people* don’t know that Italian pastries ( like sfogliatelle and cannoli) and cheesecake often contain a ricotta filling.
Lamb. Must be broiled, grilled or roasted. Lamb stew makes me retch, I cannot get it past my nose.
+1
I hate bacon the way it’s usually served. I have no interest in overcooked bacon and will usually only eat it if i make it myself. I even buy slab bacon so i can cut it to the proper thickness. Same goes with bacon bits, if i want bacon on my potato or anything else I will make it myself.
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Same here! 
Yep, I do the exact same thing. Frosted Mini wheats are great snack food.
Try soaking them overnite with some onions, red wine vinegar and a little olive oil.
Bwah-ha-ha!
I only eat bacon if it’s part of a bacon, egg, and cheese [biscuit or croissant].
I will only eat tomatoes in smooth tomato sauce or as ketchup.
No chunks of cooked tomato in sauce, soups or stew; and absolutely no raw tomato…not even those gorgeous ones from my own garden.
Count me in as another smooth, cooked sauce/ketchup-only no tomato person.
It’s a texture thing for the most part.
Shrimp is another one I’ll eat only in one way: Eggrolls. And I must throw up a sign of solidarity with the fresh tomato haters. Tomato sauce/paste in a can is a staple of mine. An actual tomato- that’s a weapon to be thrown in protest.
There was a stretch of time during which the only way I would eat peanuts is if they were “prepared” by being placed inside a Snickers bar first. Actually, for the longest time, I simply wouldn’t eat peanuts at all. I just had no use for them. Then, for whatever reason, the humble Snickers bar presented itself as an acceptable delivery system. Nowadays, I like peanuts to the point where I’ll buy a jar at the store and just eat one handful after another. Tastes, they evolve.
I’m sort of indifferent to grapes but I love them in their processed, alcoholic form in a roundish glass:)
I only like oysters if they’re prepared ‘non slimy’ - well steamed is good, and mixed in some other dish is fine, but lightly steamed or raw makes me shudder.