[Tsuyako]

I'm a vegetarian too and I can understand what you're saying. On a Geography trip, I had this guy who kept calling me 'Veggie' instead of my real name >.> that got on my nerves.
You shouldn't let people get you down. Of course you're not anorexic, you just choose not to eat meat which is your own personal belief. Technically, if someone calls you that, you could turn around and call them obese because they eat meat...of course that's not true but it's what they're doing to you.
Just tell them that not eating meat isn't a way of life, it's what you chose. It doesn't make you any different to any other person, it just might mean you pick the vegetarian options in a restaurant.