Of course, if you photograph the behavior of women and men at a particular time in history, in a particular situation, you will capture differences. But the error lies in inferring that a snapshot is a lasting picture. What women and men do at a moment in time tells us nothing about what women and men are in some unvarying sense - or about what they can be.
Mismeasure of Woman: Why Women are Not the Better Sex, the Inferior Sex, or the Opposite Sex (ed. Touchstone, 1993) - ISBN: 9780671797492