I suppose there are a few reasons to consider that kind of "progressivism" now. Nuclear weapons, globalisation and whatever else means human history is now kind of singular, so it could be argued that we have to now have a singular value system and from that I suppose some will say there can't be a WASP elite or whatever. My issue with the last part is there is far more of a an ashkenazi elite in America nowadays anyway, they're like half of the billionaires and behind half of the campaign contributions, but are like 2-3 percent of the pop. Anyway social science about privilege, power, minorities etc that whitewashes that is retarded and pointless. Also, it remains to be explained how there can be a society without a value system. Even if ebonics became an indicator of being upper class, that would simply be an inversion, a bit like when French became dominante in conquered England or how the alawites in syria became the dominant group after being a disliked poor minority for most of their history.