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.