I still don't eat a lot of vegetables; my health vitals are generally fine when I do bloodwork, as is my heart health when I get that checked so hopefully I don't end up in an early grave.
If they don't like something, fine. Totally cool, we don't care. The second you pressure a kid to eat a vegetable or a fruit, it becomes a fight and they will dig their heels in. Just keep serving whatever you cook, and either they'll come around or they won't. After all, they're human just like we are - we all have foods we like and dislike, and that's OK. No point in striking a deal, just keep exposing them to a wide variety of stuff and eventually they'll try it all - if they like it, great, if they don't, oh well, at least they like other stuff.
I can't speak for any other parents but myself, but this approach has worked wonders for us. Our kids definitely do shun certain foods or look away, but they eat a very wide variety of food. We don't have to bring a PBJ with us to a restaurant, or chicken nuggets to a friend's house, because they'll usually eat most of what is served. We've had grandparents bring "treats" over - we'll put them on their dinner plate with the rest of their food and, hand to god, last night my 5yo ate half her candy bar and left it there while asking for multiple helpings of peas and devouring her entire turkey burger. Only thing left on the plate was the candy.
Everyone's mileage may vary, obviously.
/shrug
My girlfriend works as an occupational therapist. For kids with severe food issues, they take a sensory approach. They identify which specific aspects of food trigger aversion and desensitize kids to those triggers in a gradual and indirect way.
For example, many kids have trouble with “mess:” tacky, liquid, sticky sensations that are a party of many food items. To overcome this, they do “messy play,” which might involve having kids touch shaving cream and work their way up to spreading it around.
Maybe I'm particularly bad at disguises or maybe my kid (just one, not the other) is Sherlock Holmes for food disguises, but this is nearly impossible for me. In that I can't generally find a way to do it.
And he's remarkably astute detecting flavor variations.
In your case, I would furthermore gamify it: I bet you can't figure out what I added or did differently!
And then I have the other kid. He will refuse to participate in the game. I keep the pressure on though. That means he's always exposed to foods outside the comfort zone without too much pressure. But efforts at subterfuge or psychology almost always backfire with him. So I keep all the cards on the table.
"This is a broccoli piece. You have to taste it or else {bribe}".
I don't have all the answers, but we've tried a lot of things with him.
I think zero pressure + constant exposure is the overall key.
For dislike you mean like rotten or spoiled food? I'm not sure I've met food in proper edible condition that I didn't like.
I've tried most cultures' foods, at least.
That being said, I won't eat food that is obviously (and provably) dangerous like Korean live octopus, Casu martzu (cheese with maggots) etc.
But they're hiding in there, you can't tell they're there. I still don't "like" carrots, but I don't mind eating them if I don't taste them. There's a difference between the two, I think.
That said, to your point, I was super picky as a kid, and that approach (trying food I didn't like in a dish that I did like) helped me quickly not be picky when I was a younger adult. My palette is tremendously wide now and there's only a relative handful of things I don't "like". I'm also now always down for an adventure and experiencing something new, so I'm happy to try weird shit, whereas I never used to be.
You don't see this with e.g. film or music, somebody pridefully saying "I'll listen to anything anybody considers music" like it's some sort of badge of honor to have no preferences.
I'm not trying to knock you here, it's just weird to me to be proud of having no preferences.
A "picky" movie watcher isn't really the same thing as a "picky" eater. The eater is doomed to be locked in a cycle of working around their preferences for as long as they live.
Have you ever tried hákarl (fermented shark)?
https://en.wikipedia.org/wiki/H%C3%A1karl
I think if you tried enough things, you'd come across some edible food that doesn't suit your taste.
I can buy "I'll eat anything." If what you mean is "I like everything that someone somewhere will consider to be food," well, color me skeptical.
Like I said, I haven't met the food I don't like yet. It is impossible to know how I feel about the foods I haven't yet met. There is an infinite selection of food out there. Perhaps something will cross my plate someday that turns up my nose. I always try new foods when I have the opportunity, but that day hasn't yet come.