Article raises an interesting point... I think the divide is valid between social class and economic class, however i will say it is much more fluid in US than in most other countries both developed countries like UK and developing countries like say India. I think the reason is because to the US point of view the ultimate social goal is financial success.

Next interesting point, I think a lot of the outrage with Donald Trump from within the republican party is he is projecting 'lower' class based signifiers and in effect turning power from the 'upper' class republicans to the 'lower' class republicans.