Most Helpful Guy
This might just be anecdotal but a lot of vegans I see and meet tend to have mental issues, maybe because of B12 vitamin deficiency, I'm not sure, but it really turns you off from getting to know somebody better when they tell you, "I'm vegan."
I personally don't think a vegan and a meat-eater would be able to function in the same household too well. Vegans are too strict about their diet and typically advocate against buying anything that involves animal byproduct. Vegetarianism might work because there seems to be like ten different types of vegetarians. Some eat fish, some consume dairy, etc. I doubt a vegan is as open-minded as a meat-eater is to dating somebody who holds a different opinion than they are, but it could probably work with a vegetarian.