Can't you just tell them? "I'm eating a sausage." Or whatever it is you're eating. Are you assigning some kind of motivation to the question that may or may not be there? It is easy to read all kinds of things into what could well be a harmless question. Maybe they said it because it smells good and they want some.

Just try to let it go. You can work on you. Your emotional responses are yours to own. Chose your battles, and don't make ones you don't have to fight.