Veganism is a religion, not a diet.

Think about it.

Eat vegan food. Kosher, halal.cant even accidentally eat non vegan stuff. People on diet to lose weight won't spaz out if they eat a cupcake or something. Vegans do.

Wear vegan clothes. Burka, tassels, whatever the caps are.

Vegan bands. Choir.

Usually vegan tattoos.

Vegans usually won't marry non vegans. Like Jews marry Jews, Catholics marry Catholics.

Vegans raise their kids vegan. You don't do this with basic diets. Moms in 90s didn't make their kids eat Atkins diet. It was for them only.

Not content just being vegan. Have to proselytize people to veganism and look down on non vegans. Even vegetarians. That even a thing anymore?

Look up the creepy origins of vegetarianism back a century or more ago. Was deliberately started to remove the joy from food. Make food bland. Flavorless. Unenjoyable. Corn Flakes! Mr. Kellogg. Religious zealot. Eugenics ideology. Wanted to make sex joyless too. Joy was considered a sin.

Think about today. They ruin everything you used to get joy from. Star Wars. Star Trek. Marvel. DC. Comics. He Man. Dr Who. Indiana Jones. James Bond. Ghostbusters. Terminator. Anything that was fun must be ruined. No one is that dumb to make such major failures. It's deliberate.