"Good men" nonetheless benefit from the discrimination and marginalization that not so good men perpetrate — whether they want to or not. And turning a blind eye to what other men do is also not being an actual "good man." It's what allows the problematic culture to continue unimpeded. We're all awash in what we’ve been socialized into, so this is not necessarily any particular man's fault, but it is their responsibility to do better (and not have a frickin fit of hysterics when it's pointed out to them what is taking place in the culture and how they can help to improve it).

If more men spoke up before, during, or after incidents of verbal, physical, or sexual abuse by their peers, they would help to create a climate where the abuse of women—emotional, physical, sexual—would be stigmatized and seen as incompatible with male group norms. That is, a man who engaged in such behavior would lose status among his male peers and forfeit the approval of older men.

Ultimately, this would cause a shift in male culture such that some men’s sexist abuse of women and girls would be regarded—by other men—not only as distasteful but as utterly unacceptable. In this new climate, individuals would be strongly discouraged from acting out in abusive ways because of the anticipated negative consequences: loss of respect, friends, and status, and greater likelihood of facing both legal and nonlegal sanctions. In fact, if men’s violence against women truly carried a significant stigma in male culture, it is possible that most incidents of sexist abuse would never happen.

Katz, Jackson. The Macho Paradox (p. 154). Sourcebooks. Kindle Edition.