As this piece at Vox shows , economic inequality really is rising, no matter how you fuss with the data. Possibly because of the skepticism from some, Vox explores this using differing analysis. The conclusion is always the same: economically, things are getting worse.
Data aside, this anecdotal argument at the end of the piece nails it for me:
Outside the sphere of political debate, you also see the real world impact of inequality. Merrill Lynch recommends an investment strategy to its clients based on the growing economic clout of plutocrats, Singapore Airlines is now selling $18,400 first class cabin tickets, and observers think Apple is going to start selling a $10,000 watch. Conversely, Walmart is now primarily worried about competition from dollar stores. The executives at these companies are not hysterical liberals trying to drum up paranoia about inequality, they are trying to respond to real economic conditions — conditions that have entailed very poor wage growth paired with decent returns for those proserous enough to own lots of shares of stock.
Worthwhile and recommended.