Nobody has suggested what you just said.

The suggestion was that those who don't like food unless it's hot have fried palates.

Different thing entirely, and one that I'll stick my neck out and agree with. (And it helps that I do like very hot food...occasionally)

Perhaps it's not the palate itself that's fried, but the reward of endorphins as a motivator becomes more important than the underlying meal. Kind of like a child refusing to eat unless they get a lollipop or toy with their food.