My kid likes monster trucks. I live in one of the wealthiest areas of Long Island. Tastes vary; thus the only thing IMHO that is defensibly low-class is something objectively a bad or unethical choice, like dishonesty. You're going to get into hot water ascribing specific tastes to class; I just read the other day that some of the most exclusive residences in Vegas have clientele with bizarrely specific yet very basic food preferences.
I would advise not normalizing the sort of narrative pushed by the person you are replying to by ceding ground with relation to bad behavior. A lack of class, as pengaru uses it, doesn't seem to be a useful concept, and muddies the water of what people mean when talking about class based hierarchies.
The reason I would argue it's not a useful concept is that class in this context refers to one's social signaling outputs in a national monoculture that hasn't been the predominate way people in the US have interacted with culture for decades.
