Nothing against veganism. In fact it's a pretty admirable quality if you're doing it for ethical reasons rather than just as a diet.
However, my friends who are vegan tend to be quite annoying about it. Like that's the only thing they talk about. I stopped hanging out with them because I just didn't have any input and I couldn't join in their conversations. Plus I ate donuts around them once and they gave me dirty looks.
I don't know if how they're practising it is all that healthy either because they weigh themselves everyday, which is starting to look like an eating disorder.
Basically, if you're a vegan - good. You do you. I do me. Just don't start preaching. Please.