I am a vegan. However I notice whenever it comes up, I do everything I can to skirt around the issue. I guess I just don't want to deal with other people's issues.
I never give anybody any crap about their food, or say anything political. I don't want people to worry that I'm judging them or that we can't do any activity because of it.
And maybe I don't want to see a certain side of them. The side that uses the topic as an excuse to go off on their annoyances about vegans/ vegetarians/ anything political. I like preserving my positive opinion of people. And the subject of veganism does not bring out the best in people. Discussions rarely offend me, they just bore me. And I'd rather not see that side of people.