When I get that, "I have meat at breakfast, lunch, and dinner every god damn day because I can't live with out it or I'd probably die or something" kind of chat I always chime in with a friendly, "Yum yum, I hope you like colon cancer!"
Hmm. Maybe vegans are
"oooooooooh that smells goooood mmmmm you're soooo healthyyyy wooow"
Haha, that sounds like me every day at my work too!