The problem here (which the author seems to have missed) is that due to inflation, a "six figure" income of 100K nowadays is barely equivalent to a 50K salary that your parents might have had back in 1990.

Don't believe me? Plug it into the calculator. https://www.measuringworth.com/uscompare/relativevalue.php

In 2016, the relative value of $50,000.00 from 1990 ranges from $83,400.00 to $156,000.00.

If your family makes a "six figure" income of 100K in 2018, you are still nowhere even close to being "rich" (compared to the top 1%).