It's interesting to see how people react to these sorts of social experiments. This video shows domestic violence when men are the victims and attempt to defend themselves in public. Some people may think that violence is violence and that you should fight fire with fire, that is somewhat the case here as the victim uses similar, but naturally stronger force against the perpetrator. Again, since the victim is a man, there are obvious physical differences, which by other bystanders, be seen as a possible danger for the woman. So their reactions are somewhat understandable. The thing here too is that no one reacts negatively when the woman is being evidently violent against her boyfriend. They see it as a humorous and harmless act. The man gets the biggest reactions and they're all negative, when all of what he was doing was defending himself. This could have something to do with stereotypes that make people think that women are defenseless, weak and require protection, whereas the men are violent and more aggressive. There could also be some simple thinking here, like the saying “you're less of a man when you hit a woman”, but what would be the case here when the man is being physically attacked? What if he gets shot or stabbed by his girlfriend? Should he also keep his hands to himself to keep this manly pride? There are some things that are overlooked simply by the gender of the person. Other men could also intervene to try to be heroic and win the girl over, and it's simple thinking like this that impedes a rightful and progressive view towards such cases.