I see your pov, having an all female group which doesn't allow men is a reverse form of sexism. But, it's the actions of that group that matters. It's the derogatory comments and behavior that's the key issue here. You can have an all cop, all soldier, all medical clan that excludes those not fitting the discription, but as long as that group is civil, polite, mature, and behaves correctly, no harm/no foul. It's the harassing and discriminatory behavior of those TOWARD those groups (all cops, all female, all dads) that's unacceptable. Not the existence of those groups, but the behavior of individuals towards those groups. Does that make sense?