I don't know if I'd call it purely idealist, it is determined by the evolutionary factors of Cognitive development and environmental adaptation. However I agree with the general idea with what you're saying and I think I'd lean more pragmatist. HOWEVER I'm very interested in the concept of Class Consciousness, what that actually could be (outside of the essentialist view that people will just see commonality and deduce nor it being a unique universal concept constant across all peoples), how could it form, and what historical/material and Cognitive factors could be involved. I mean there have been tons of examples of people acting in class interest, and with what I've said obviously they all didn't just follow some internal logic or well structured mode of recognition. Investigation of that requires understanding this process of abstraction. I guess I'd say the important thing in my mind isn't the specifics of the abstractions in of themselves, rather how abstraction arises in response to specific environments and Cognitive systems. Abstraction is only necessary to explain commonality between the previously unconnected, so there are some subset conditions in which commonality is witnessed leading to abstraction. We may never be able to actually map them out, but I think we can try to identify mechanisms that contribute to their arisal if that makes sense