Plenty of psychological studies of the two genders (muffled REEing in the distance) show that men are greater risk-takers and also far more prone to protest, act out, disagree, and disobey, both short-term and long-term.

If you keep a mask mandate up long enough, eventually it WILL be just women wearing them, statistically speaking. Barring outliers, obviously. Why make a strategic change when the result is probabilistically speaking going to go that way anyways?