There have been several studies on the correlation between income/wealth and empathy. https://blog.ted.com/6-studies-of-money-and-the-mind/

Assume those studies are correct (I don't believe that conclusion, personally). It displays a certain lack of empathy to interact with people using assumptions about their presumed sociological groups. This may be the very definition of lacking empathy- abstracting people into groups might make sense in studies, but when those preconceptions bleed into condemning statements, it's just prejudice.

It's easy to have empathy for people like you or that you agree with, but the real test is having empathy for those who aren't / you don't.