Celebrity chef John Mountain made headlines last week for banning vegans from his restaurant, Fyre, citing “mental health reasons,” reportedly because a vegan customer complained about Fyre’s lack of plant-based menu options. Meanwhile, a vegan landlord in New York City forbids tenants from cooking meat in his $5,750-a-month apartments.

What’s the deal with vegans? Are they all self-obsessed, birdseed-eating eco-warriors who are only able to wash down “cheese” made of arrowroot with a massive dose of ego? Or are they disciplined, clean-living champions whose commitment to the cause merits our admiration and imitation?

Had you asked me my opinion of vegans a few years ago, I...