Nowadays, whenever I speak to someone who "dislikes" a certain type of food, I always try to persuade them to try enough of it to like it, even if they don't want to like it now - because if they did like it, then they would regret not liking it, and it would make them appreciate more things as a result.

One of the great ways to become a snob is do side-by-side comparisons (NancyLebovitz has links in another comment.) If you drink cheap bourbon immediately before expensive bourbon, the difference is highlighted compared to drinking them a week apart.

Many people who have done that have regretted it, though, because it ruins the cheap variety for them. Whenever they drink the cheap stuff, they think "this is so much worse than the good stuff," and so either their hobby becomes significantly more expensive or gets curtailed (because now they can only afford it a fourth of the time), and it's not clear that their overall experience is significantly better.

I, for example, have very picky tastes in food. The diet I choose for myself costs about $2-3 a day, and consists mostly of simple bread I make myself and water with a touch of lemon. I'm satisficed; would I be all that much better off if I made the investment to switch to steaks and cola?