True! That's why you want to whisper to a friend, ideally one who invited you along. This 1. minimizes the exposure of you being an outsider 2. minimizes the friend's exposure of having invited an outsider and 3. shows your friend that you aren't going to embarrass them, making it more likely that you'll be invited along in the future, assuming you aren't sick of this shit already. Ideally, you'd rake a risk assessment of your options and balance that with the friend's comfort level and how close you are to one another.

I feel like a lot of class conflicts are, like, excessively direct expressions of emotion or conflict, or inappropriate subjects of conversation. I don't think people are going to be made uncomfortable if you ask what some kind of food is.