[vintermann]

Well, are you a vegan for purely health or environmental reasons, or ethical ones?

If you follow a vegan diet/lifestyle but have no problems with anyone else's animal killing, I guess people will catch on and be relieved. But I'm also sure that if you do mind, people will catch on to that too and may give you unpleasantness over it.

[luckylion]

I did it for spiritual/ethical reasons, but I never tried to make anybody else adopt my views. I'm sure I would have had unpleasant exchanges if I did, but it's not like I'd be pleasant to be around in that case, so that wouldn't surprise me.

My point is that I doubt it's about the "I'm vegan" part that people react annoyed to. I'm pretty sure it's the "and you should be too" part that some vegans adopt, and they are the ones that people are annoyed by.