My first guess: comparison of wages for men and women but adjusted to take into account years of experience and occupational choices. That comparison doesn't align very well with the ever popular "census data" report about wages for all women vs all men which "proves" that woman aren't paid "equally".

Almost any data that paints a positive picture of progress in the last 40 years will get you nuked. For example, median household incomes have actually risen and Americans are generally far richer today despite healthcare and education becoming more expensive relatively.