Will men be allowed to participate in Glassbreakers?
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.