Haha, I love all of these!
I have also gotten the "I wish I had that!" and I want to punch them. Every time. It's almost as bad as "I could never do that". Well, you could, if you had to...
Speaking of medical professionals, when I told my doctor that cutting out gluten stopped my migraines, her response was, "huh".
Re: people who are gluten-free but still eat it, I know someone who eats gluten all the time. Mostly she just gets diarrhea (which she doesn't mind), and if she eats it a LOT she starts to get migraines. And then it's "awe, man, I have to rest. This totally sucks". Her general philosophy, is that if she's going to eat gluten, she should have a lot so it can get out of her system...? She makes no sense. This is the same person who told me that I can't have cheese because the anticaking stuff is flour (which maybe used to be the case but isn't); that gluten can be absorbed through the skin and make me sick; and that I can't eat meat unless the animal was gluten free as well. Until I did some research, I was living off rice and fruit. I lost 7 lbs in a month! She just wants people to think it is so hard, and that it sucks being her. And then she eats it anyways. GAH!