Because you're using data that doesn't control for occupation, hours worked, etc.
No one is saying that, it's more of a strawman you want to use to, I'm not sure, maybe accuse people who disagree with you of sexism. Or could you explain why you use those words rather than assume we think it's, let's suppose, just a choice based on differences in average values men and women have?
TL;DR: go away troll.