If it is only one or two items, you are right to respect this aversion.
As a child I was not a picky eater but I **hated** canned corn. My parent insisted that I at least “try it”.
Well....As an adult I developed a violent allergy to corn that manifested itself in idiopathic dermagraphism ( a form of hives). My mother who was then in her eighties would occasionally apologize for making me eat corn as a kid. She felt really bad about it.
He still doesn’t eat mayo, cheese and mustard and he eats everything. I also figured he was better of without those things anyway. He has been living in China all summer and we joke about how happy he is without any cheese.
Absolutely. A genuine dislike isn't "picky", IMHO. My kids dislike cheese (except Mrs WBill's homemade Mac and Cheese, go figure). Since she and I do the cooking and we rarely eat out, it's easy to leave it off.
Have you ever made pizza without cheese? I look at it and say "Bleah". The kids absolutely love it, it's one of their favorites. So, I bake one for us "All the way" and one for the kids consisting only of crust, spices, sauce, and whatever toppings we have around. Works out fine.
My list.
Mushrooms, onions, peanut butter, shrimp.
I do like sushi for some reason, so go figure.