Only encountered it once maybe two years ago. Was in a part of town I am not often around anymore and dropped in a coffee shop I used to frequent. The staff couldn’t have been much older than 20, all with bare midriffs that I have never seen in food service before (this is kind of a grungy art district spot, but still). Ordered my coffee and asked about their food which used to have some gluten free options, and got a blank stare for maybe 10 seconds.

That’s it. Just once. Not a general stereotype but I’m not exactly well traveled so maybe more regional?