[kevinh]

If you're hanging out with someone, it's almost impossible for it not to come up that you're vegan, since a large amount of places to eat have no vegan-friendly foods. You either have to bring up that you can't eat somewhere (since it has nothing you can eat) or not eat at all (prompting questions about that).

[Alupis]

Good point. I guess the only time someone should care about your dietary preference is if you're having a dinner party or going out to eat.

That's appropriate use of the "I'm a vegan" line...

Just don't go over the top and tell people they're bad for eating a hamburger or inject your veganism into otherwise irrelevant conversation.