Maybe being in DC has clouded my outlook, but it seems to me that women are the ones getting the education and getting the high paying jobs.
We're living in a bubble here. I come from one of the deeply red states and there's is certainly a wider discrepancy there. However, it is amazing at how most of the women who grew up in that environment will accept or even reinforce the status quo, so I wouldn't be so sure that female HR employees can be relied upon to buck the system.
My mother still lives in that same state and recently found out the man she trained at the health food store was making more per hour
while she was training him! She of course demanded an increase.
In white collar environments, it seems DC is better than average. However, it is also my experience that when I first came to DC I worked at a department store while I interned. One day, we stated comparing hourly wages and I was incensed at how all of the guys made $3-7 more per hour! I immediately asked for a raise and persisted until I got one.