Glassbreakers is currently only for any one who identifies as a woman (cis or trans). This is because on a global scale, women face different career challenges that are specific to their gender. We hope that by connecting the global female workforce to each other we can speed up the process of a true gender balanced workforce. We do, however, want to keep men a part of the conversation and a part of our community. Anyone who believes is the social, political and economical equality of sexes is a Glassbreaker. We're saving the information of the men who do sign up or reach out because they want to help and are brainstorming creative ways to keep them involved.
It would be pretty easy to cite circumstances when women are excluded and men are excluded. For example, there are men's only colleges and women's only colleges, and the number of women's only institutions of higher education greatly outnumber the number of men's only institutions (The only one I can think of is Hampden Sydney in Virginia).
Personally, I'm very anti-gender binary, so my purpose of commenting here is that it is intellectually dishonest to cite examples where women are excluded and conveniently omit examples where men are excluded.