To some extent that is true, but why doesn’t “our own kind” mean Americans, rather than gender, racial, and sexuality divides, to name just a few? We live in a society that was founded on inequality of various types and up until 50 years ago had laws that codified and enshrined that inequality as only right and normal. The thinking that accompanied those laws doesn’t just evaporate because the laws have changed. I think it’s naive to imagine that what our culture reinforces as “other” has no bearing on how those who fit into that category are treated. We live in a patriarchal dominance hierarchy. Social stratification is a “natural” part of this type of social system, as distinct from more egalitarian cultures. One of the main “functions” of a patriarchal dominance hierarchy is to hold and maintain traditional power while at the same time preventing others from having access to that power — which is exactly what we see in our culture.
Up until fairly recently, everyone, including women, saw men as more competent in the workplace. This would belie you “our own kind” theory. Interestingly, at this point in time, overwhelmingly everyone including men, now sees women as just as competent or moreso.
