There are clans for men only (thinking about Dads of Destiny here), and speaking personally, I think they're great. They have a particular mission and by all accounts, provide a great, supportive environment for their members. What's not to support? Even if there were a male-only clan of woman-hating misogynists, they would still have a right to have their group. If they'd put that in their clan description, it'd be superhelpful actually, since it would let me know ahead of time to steer clear of their members.