For anyone who has a hard time keeping up with current permutations of gender theory, the Harvard Business Review has a useful explanation of "What Is Second-Generation Gender Bias?" in this article side box. An excerpt:

"Research has moved away from a focus on the deliberate exclusion of women and toward investigating “second-generation” forms of gender bias as the primary cause of women’s persistent underrepresentation in leadership roles. This bias erects powerful but subtle and often invisible barriers for women that arise from cultural assumptions and organizational structures...

"Double binds.

"In most cultures masculinity and leadership are closely linked: The ideal leader, like the ideal man, is decisive, assertive, and independent. In contrast, women are expected to be nice, caretaking, and unselfish. The mismatch between conventionally feminine qualities and the qualities thought necessary for leadership puts female leaders in a double bind. Numerous studies have shown that women who excel in traditionally male domains are viewed as competent but less likable than their male counterparts. Behaviors that suggest self-confidence or assertiveness in men often appear arrogant or abrasive in women. Meanwhile, women in positions of authority who enact a conventionally feminine style may be liked but are not respected. They are deemed too emotional to make tough decisions and too soft to be strong leaders."

https://hbr.org/2013/09/women-rising-the-unseen-barriers