Right, some additions to the brouhaha of my previous post. The court decision to subsidise a fundamentalist christian party wasn't made by the Hoge Raad (High Council) but by the Raad van State (Council of State). The full decision can now be read (in Dutch) and it clarifies a few things.
Warning! Lots of legalese mumbo-jumbo!
The way I'm reading this is that the SGP got off on minor technicalities that are inherent in the UN decision
and the conflict the UN decision has with the freedom to associate and form politial parties or organisations that do restrict membership.
So the Council of State ruled that the freedom to associate is of a higher order than the rights of women to be treated as equals.
Which is good to know I guess. My previous posts conclusions still stands though: it is apparently legal to discriminate as long as others don't do this.