> However you can’t simply dismiss a whole literature of class struggle by simply rejecting the notion of class fundamentally.

Of course there's a literature on it. Tribalism is one of humanity's most primitive traits. Being principled, reasoning, and being fair are the unusual things that develop and are developed by the most advanced civilisations. Just having different prices in shops based on who you are is normal. Having a set price for every customer is the advanced version, and less common.