One of the situations that was brought us was when we were at a car dealership and I asked the question, "Do you negotiate (or something along the lines of asking him if they haggle about prices)?" And, AH thought it was something to make fun of me about and he started laughing at how silly my question was.
Being sarcastic is one thing but you're describing something worse: taking shots at you in front of other people. That's hostile and cutting. You deserve to be treated with respect, not put down. There's nothing wrong with you, certainly.