https://www.businessinsider.com/what-it-takes-to-be-middle-class-middle-income-wealth-2024-5
"If we admit that we're very class-based — which we really are — that reveals the uncomfortable truth that we're not as democratic as we like to pretend to be, which is the heart and soul of this country," he said. "If we're not truly democracy, then what are we? That's the whole justification for creating this country."
Income level has never been the material basis of class. Class is determined by your relation to production. We've known this for a long time.