My older brother was Vegan for decades. He just did so for no other reason than he preferred to. Never tried to farce it onto any of us, including his own family. He was at my daughter's wedding reception and they brought plates of food for everyone and he ate his and the realized he had just eaten an animal.
He just looked at me and said something like, "Well, there went decades of walking the line. Big deal and he ate some more. He now eats some fish and chicken and eggs and his wife and doctors are glad he is doing it.
He has never "preached" it as a way of living better or any other farcical bullshit. One of my younger brothers was a vegetarian until about twenty years ago when his brother-in-law was in town and he and his wife took them to dinner at "Ruth's Chris". He said that was it and has never looked back.
I once asked him if his Lima Bean salad was made from "free range Limas".

Vegans like this dead witch-bitch deserve what they did to themselves. FTN.