There's a vegan café at Monash University here in Melbourne which has this policy:
Once you adopt the liberal principle that our predetermined biological sex has to be made not to matter, this is the kind of thing you end up with.
Remember, liberals believe that telling people not to speak in terms of sex, e.g. by discouraging terms like "brother" or "ladies", is making us free - to most of us it will seem like an intrusive denial of a basic aspect of human life.
Hat tip: Traditional Britain Facebook