I poke back also, really over it since the first time I stopped eating meat I was 16 (now 52). It is just crap to hear about it all the time. At work I have a chart at the snack table for any food issues of any of the children. When I have subs come out I show them around including that list. I get comments on the vegetarian students often, so I tell them I don't eat meat.
I think next time someone comments that I look young I am going to say veggie instead of meditator