The one thing that really bugs me with people who eat meat is not the eating meat, but the attitude of quite a few (not all) of these people. A lot of non-vegetarians can be rather nasty. And they can also be rather ridiculous. I have been offered money on numerous occasions to eat meat, like I'm some freak show entertainment. I've had to sit through meals with the people with me looking at my food in disgust, and being subjected with jokes every time I take a mouthful. I have had people put meat in my food as a joke, like I'm going to make a scene or something when I discover it. And I have been labeled with stereotype and probed with million questions. And I'm not over-exaggerating any of that. When I went to my cousin's sons birthday a few months ago, one of my cousins mates who I'd never met was REALLY laying into me with jokes and comments in front of everybody every time I went to eat something. My cousin was fuming about it but even when he told his mate to shut his mouth, he kept doing it. And then he did the whole 'oh I'm just kidding, I'm just messing with ya'.
It's extremely rude and immature.

That's the thing that irks me the most. No I'm not going to go have a cry, no I'm not going to make a scene or get into some tree hugging protest. When I have to mention I am a vegetarian, I have to be prepared for the possibility that someone is going to take the piss. It shouldn't have to be a big deal.