A friend of mine does not like cheese. We treat it like a food restriction for him when he comes over for dinner, so we make sure there are non-cheese options for him. One time, though, he went through three servings of a rice dish, chowing down eagerly, until he realized there was cheese in there, and he suddenly retroactively didn't like it.
If you actively reject the idea of liking them, of course you won't like them!
What does "actively reject" even mean? I reject Thai food because I tried it at a few different places and didn't like it. I can even explain how to me all the spices just blend into "hot" with no additive value. Am I actively rejecting it? If I've played some more narrative style games here and there, read up on PbtA and BW style games and realize they just don't work for me am I actively rejecting them? I played D&D 4e for a couple of years and it just never really clicked so I don't want to play it or anything similar. Same question.
Seems like a lot of people are really invested in this idea that we don't like a specific <food, game system, version of D&D> it can only be because we just don't know any better. Every once in a while like with your friend and cheese it may be true. But the majority of times? People are willing to change if they find that they actually like something. But if they just plain don't like it? Telling them "Try it you'll like it" is just annoying.