All diets have consequences to health. As long as they are honest about those and don’t try to press their beliefs on to others, I have no trouble with them. The minute one of them spouts scientifically inaccurate information without suffering correction, or attempts to tell me why people who eat meat are comitting a grave sin, I lose my patience with them.
And the ones who come to me and tell me why I’m an evildoer for eating humans are so ridiculous as to earn my absolute scorn, however politely I choose to phrase it.
But this is true of any diet. I don’t tolerate carnivores or omnivores to make fun of vegans without learning about their own dietary consequences.
I think my dietary consequences are well-known and unworthy of discussion.
As for their food, some of it is lovely, but to me it all feels too light and too much like eating a salad, which I cannot do, for fear of recklessly slaughtering everyone around me. But as side dishes, I’ve no complaints.