system
A chat on subreddit /r/NoStupidQuestions
human
I once invited vegan friends over for a BBQ. Telling them I'd make sure there was plenty of vegan for them.

They refused because they dont want us to eat meat.
gpt
I've also met a number of vegans who won't eat food cooked in or on surfaces that have previously been in contact with non vegan food.  Is there a legitimate physical reason for this behavior or is it just more sanctimony?