Picky eaters may be super-tasters, but it's not necessarily the case. I know people that claim that is why they are picky, but they will eat things that a true super-taster wouldn't touch, while claiming that their "super-tasting" is what makes them not eat something that has nothing to do with the mutation.
I'm not an overly picky eater myself, but I'm not a super-taster, I'm a super-smeller. I have an incredible sense of smell, so there are some foods I just can't bring myself to eat no matter what, because the smell is wrong for me. Asparagus, for example. I am also horrified by people eating whole crustaceans and black olives - it's a borderline phobic response that I'm not entirely sure why I have.
I think the picky eaters who were "spoiled by permissive/lazy parents" are easy to tell as the ones who whine loudly over other people's food choices, make faces, and go "EWWWWW" over anything they don't want to eat. No matter how you feel about types of food (or your taste sensitivity, allergies, etc), you should have been taught a polite "No, thank you", or "What's in that? Oh, I'm sorry, I can't. My doctor has told me I must never eat shellfish, or risk an ER visit. I would hate to spoil the party, but it looks delicious". I know some outrageously picky eaters as adults, but none of them ever make a production over the fact that I'm eating food they wouldn't touch with a 10-foot pole.