Earlier quoted context omitted.
So your response can be summed up as "Well maybe the men are just better on average?"
No. He said "any systematic discrepancy is blamed automatically on some kind of discrimination, without consideration of the possibility for consistent differences in merit between subpopulations." This doesn't factor in which gender is more represented. Parent could have said the same thing about nursing or elementary school teachers but that doesn't mean they're implying men are better than women.
GP used a lot of big fancy words to literally(!!) say "Whenever cases like this arise, people are so quick to jump to 'sexism' as the answer without even allowing for the possibility that women just actually are worse employees than men."