Exactly.
In this cae this was especially true. He taught physics and his brother worked in a nuclear power plant even though he was morally opposed to anything that could lead to nuclear weapons (fair enough). Never let his beliefs intrude on teaching and laughed off any time we would take piss (it was a semi-informal relationship with him for the better students, I was his favourite 
).
Being Vegan is so extreme - no leather bound books, no wool, no eggs, no milk, no meat (obv), no cashmere scarves designed by Gucci. Bar the taking piss at last part, that is half my lifestyle gone. Also limits choice of cars.
I think those that can be this strict, its pretty impressive and i commend them for going all the way. Much more impressive than the coworker or family member we all know who loves saying how she/he is christian, awkwardly drills you about your beliefs in innapropriate settings like work, but decides when and how far to go with their own christianity based on how conveienent it is for them. You know the type; complains about gay people getting married, while they cheat, lie, gossip, all day long.
I didnt even think about the stuff you mentioned when it comes to being vegan, which makes it that much harder now lol. I try real hard to only eat meat if and when i know where its from, which is impossible when u eat out or see friends. So , i have been eating as vegan/vegetarian as possible. I never even tell people about it, its not important. The vegans and veges i know, never really mention it either so i have no experience with the talking vegan head who preaches. That would indicate a sociopath, and i dont know any of them (luckily).
However, where i live, i DO hear all day everyday how "christian" someone is. They loooove talking about that.
