I hated peas, Brussels sprouts, and carrots as a kid.
Now, I love peas and nicely roasted Brussels sprouts. Parents had served boiled, possibly frozen or canned (not sure) so I hung back for years and years - and I always loved most of the rest of the Brassicas... Now, good roasted FRESH Brussels are to die for.
Carrots: I still don't like them. YES, I included them in the pancake recipe I just made. For photography color, and because the source recipe I mildly adapted used them. (What I do for recipe sharing.... I'll make the recipe again but NO CARROTS again!)
I'm fine simmering carrots in mirepoix for hours - it's the more raw and less cooked states of carrot that I cannot abide.
There are some cultivars of kale I don't like - but others are awesome.
I hate it when I go out and the skin is still on the cucumber in salads in restaurants. The silly fad of shaving HALF the skin off and leaving the rest makes me angry. Don't be lazy - finish the job! (Here I'm talking about the regular supermarket-style cukes - many of the farmer's market cukes don't have that heavy skin, and a thin skin on a cuke is acceptable to me.)