Reaction to Women Abusing Men in Public

This ABC news experiment shows a woman publicly abusing her boyfriend verbally and physically. In a previous experiment men who abused women in public were confronted by passersby.

In this documentation, Carrie Keating explains that men create more damage but women abuse men more often. As the girlfriend beats her boyfriend passersby either do nothing or have interesting reactions. Often, when people see the girlfriend beat the boyfriend they assume the boyfriend did something wrong.

How does the gender of the abuser affect the reactions of passersby? Why is it okay for women to abuse men but not vice versa?