I think what gets people up in arms is the people who say they are "gluten-free" and then go and eat fried rice with regular soy sauce for example. The people who claim bread and pasta free is gluten free. And as with everything in life, we as the quote-unquote experts of what is and isn't gluten free, should take it as a learning/teaching opportunity. There are a lot of people who don't understand what the words "gluten free" mean (I gave one of them an earful today when he put normal bread in the dining hall's designated, labeled gluten free toaster) let alone just how serious those of us with celiac's have to be about things like cross contamination.
I'm not saying get on your high horse and preach but maybe offer to show people exploring the diet the ropes and correct those who just don't know any better.
But back to the original topic, that girl has more issues than just going gluten free. The more worrying thing in that post was "1000 cal diet." Hopefully her body reacts as quickly as mine does to calorie deficit (I pass out continuously after just 2 days...yay flu) and she'll realize that's not enough.