Not just celiac, but some people are keto for medical reasons (e.g. epilepsy). However, those people are also off other items, including many gluten-free subs.
I'm sick of food shaming - people who look at you because you're not gluten-free/keto/vegan/whatever. I've also been stared at for eating soy. It's not like I'm eating it DAILY or large portions. And to be honest, I've already (mostly) given up rice. Giving up something else that is part of my ancestry is, well, marking me as a sell-out (#kiddingnotkidding).