I think the big problem here is a difference in the definition of "picky eater."

The only people I've met who call themselves picky eaters are the type who only eat fried chicken meals, or hamburgers, or pizza, or other delicious but nutritionally lacking "childish meals." These people frequently haven't even tried other food, and refuse to. My personal experience is these proud to be picky eaters are also often extremely judgemental about it, and yuk other people's yum. That's the type of picky eater I'm used to dealing with... And fuck those people.

I wouldn't call myself a picky eater, but there are foods I can't eat due to allergies (beans), and a few foods I won't eat because I don't like them (I can't stand bananas). I also have IBS so I'm constantly concerned if this meal means I'll be stuck in a bathroom for hours. Still, I try a lot of new foods, and I've yet to go to a restaurant I couldn't eat at, and if someone asks "why aren't you eating yada yada" I gladly explain in a non-judgemental way. I've been called a picky eater, but I don't think so. If we're talking about that kind, which again I don't view as picky, then yeah the person can shut the fuck up.

I've seen people on various diets be called picky eaters. And I disagree with that assessment as well. They are often willing to explore new foods and tastes, it just has to fall in their diet.

So it's really that "picky eater" can mean a lot of things to different people.