Are you strictly dating vegans? Maybe you are open to dating vegetarians? Maybe you view it as a personal choice and you don’t mind dating non-vegans?
Does the goal of the relationship change your answer? If it is a long-term relationship, or a short-term one, or a casual one, or friends-with-benifitis or even a one-night-stand?
I’d love them to be vegan just to make our lives easier but I’m kind of used to since all my friends are meat eaters anyway. I’m just getting back to the market after breaking a long term relationship with a vegetarian, so I’m not sure yet where to put my boundaries, it is said that the 0,7% of the population in my country is vegan, so I may die single looking for a vegan partner.