Preventing and reducing misogyny would be tricky, but I think that a way to start is by building self-respect and self-love and addressing thinking errors, problematic beliefs about women, and harmful media consumption. The best way to reduce prejudice in the long term (at least by what I've learned in psychology classes in college) is by positive intergroup contact that builds trust, but starting with those things could make interactions with women go much better for both parties. In my opnion, having close relationships with women that are the most communal possible (e.g. close friendships) can also help. I also feel like, as a general rule, the group should be moderated by people who are in healthy relationships, who are sticking around after leaving it to help, or who otherwise don't need it for support. This is so that it can function best as a support group for men who are struggling.