Marduk, I agree that it's problematic to have a basic refusal to try new foods and I agree with bob that there are certainly aspects of food pickiness that are environmental.
What I really dislike (and what I'm probably railing against) is the sense of moral superiority that seems to accompany people who force their kids to eat everything on their plates. Note how the reader who asked the original question casts trying new foods and eating foods you don't like in a positive light and links those traits with the "food boot camp" attitude of his parents. Also notice how he links being a picky eater to being whiny or high maintenance. (And yes, I realize I'm indulging in my own bit of bias by using the phrase "food boot camp.")
I suppose I could be classed as a picky eater, by some definitions, but my pickiness doesn't come from my taste buds, but from chronic GI problems which often make it painful to eat. If you've never sat crying over half a grilled cheese sandwich because it hurt too much to finish eating it, I don't suppose you can really understand.
And I think that aspect is perhaps the crux of the problem. It's easy to make arguments in favor of eating what you're given: Mind over matter, new experiences are good for you, do what you're told, suck it up, quit whining. It's very, very hard to explain certain kinds of pain and difficulty to people who have never experienced them. As a result, the "suck it up" people become even more convinced that they're in the right while everyone else is just weak, lazy, or scared and the people who are going through something difficult but hard to explain begin to doubt their own experiences or at least learn to shut up about them.
It's funny that you should bring up listening to music, because I have issues in that area, as well. It's not a matter of education (I'm a classically trained pianist) and it's not a matter of taste, really, because I can learn to like almost any genre of music. However, I have always had a hard time listening to new music. I don't listen to music stations on the radio, ever, and there are some days that I'll turn the radio off if they do even a short music segment on NPR.
For years I thought it was some sort of personality defect until I read something about autistic children having a hard time with sensory overload and something clicked. I don't think I'm autistic, but I do think that my problem with new music is a sensory issue because it actually hurts to listen to music, a lot of the time. But, again, if I tell most people that I can't listen to music because it hurts, they'll tell me I'm being whiny or high-maintenance.
Marduk wrote:I also find it odd that the only two people who seemed to justify picky eating were picky eaters themselves. Just sayin'.
This isn't odd at all. As I said above, picky eaters are unlikely to be able to explain to a non-picky eater why it's hard to eat new foods or certain foods. Consequently, most non-picky eaters aren't going to be able to understand or justify the behavior, if they're even willing to tolerate it. (Also, formerly picky eaters who become less picky eaters run the risk of assuming that what worked for them can work for everyone else or that all pickiness has the same underlying causes.)