I doubt the donors and lobbyists find it laughable pixie, with that historic baggage that is a throwback to slavery and feudalism... though time added a few variants, the robber barons and financial oligarchs.
"nobody has yet said what different classes actually mean."
There have been some good attempts at explanation here, BUT you are looking for a phantom pixie, THERE is no one definition as it means different things to different people. cf democracy, communism, God, happiness,,,, Class War, them and us, have and have-nots.