Thanks.
The brother of an former boyfriend tried to get me to argue with him because he ordered a steak at dinner. He was all "Aren't you a vegetarian?" He was really perplexed that I didn't care what he ate.
I've had that happen a few times. Someone offers me a bite of something, I say "No thanks," they offer again, I say, "I'm vegan," and they respond, "Oh, you think I'm a murderer for eating this, don't you?" (Or, in the case of my officemate, responds by asking about the Jewish law concerning hunting, and whether there is any Jewish holiday on which one is required to eat something non-vegan.)
That kind of reminds me now of a Rosh Hashanah dinner when I was a teenager. There was some dish where we'd made a vegetarian version and a meat version, and my mom's cousin kept asking me about why I wasn't eating the meat version. I tried every polite answer that I could think of -- "I'm vegetarian," "I don't eat meat," "That dish has beef in it, which is meat, and I don't eat meat, so I'm not eating that dish," -- but she just KEPT asking, like, nonstop, "But what's wrong with meat? Why don't you eat it?" My mother had a very firm rule that there was to be no mention of dead animals at the dinner table, so I tried, "I'm vegetarian for animal rights reasons." And she responded, "But what do animals have to do with meat?" At which point I just blinked at her for a while.