I've tried to like oysters but I just can't swallow them. I love most fish and shellfish but can't abide whelks and cockles (just gristle) and don't like coley (smelly pollack) or farmed salmon (strangely dry).
Anything that seems slightly artificial: small corn cobs, mange tout, tofu.
I don't like corned beef, spam, butter beans, swede, turnip, tripe, mushy peas, meat and potato pie - all these largely because of school dinners as a child.
Also kiwi (I dare not tell you what these remind me of), kale (cooked leather), cooked celery and pomegranate. I get that the colourful look and juiciness of the latter is lovely, but those seeds....
This all sounds as if I'm pretty fussy and must be a nightmare to feed, but in fact many of these foods don't come up much in my normal life.