As kind of a tangent, it is, in fact, a little bit nonsense. One of the problems with the "men are violent, women are victims" meme is that so much of the time, much violence by women has been discounted or ignored.
Women committing violent crime against men has generally been treated as a joke, and male victims as contemptible, or not truly victims, by mainstream culture. Or it's been treated as justified regardless of the actual circumstances. One fact that frequently gets ignored is that women are equal with men for committing acts of domestic violence. Although women are more likely to be injured due to physical size differences, they are also more likely to use weapons, either purposed or improvised. That's why so many police jurisdictions have policies to detail both parties in a domestic abuse situation until the actual party at fault is determined. But that doesn't stop the popular perception of domestic abuse as a crime committed by a man against a woman.
Another part of the problem is that, outside of gang/organized crime-related violence, instigators of violence most often target those who they perceive are weaker than themselves and who cannot effectively defend themselves. Men who commit violent crime tend to target weaker men, and women.
Women who commit violence tend to target children, the developmentally disabled, and the elderly.
And there has long been a cultural expectation of women as passive, nurturing, and generally incapable of the kind of assertive behaviour that is stereotypically male. "Girls don't fight, only boys fight, girls talk." And there is the pervasive religious attitude of women being subservient to men, so if they do commit some sort of violent act, it's presumed to be at the behest of a man, or that they were driven to it by a man: eg. Karla Homolka.
This is especially problematic when it comes to child sexual abuse by female perpetrators, which investigations of various sorts have come to the conclusion is badly underreported, and far less likely to be believed when it is reported.