The Far-Right really took off in the Netherlands under the leadership of Pim Fortuyn who was very openly gay.
Think about it: one of the first leaders of the modern Dutch Far-Right was openly gay and nobody cared to the point that he was politically very successful as a Far-Right leader. In which other country in the World would the Far-Right types be fine with their leader being gay?!
In my own personal experience (I actually lived there for almost a decade), the Dutch have the healthiest take of all when it comes to sexual orientation: it's all normal and in domains outside sex and romance treated as just about as relevant as people's eye color (i.e. pretty much nobody cares).
All this to say that from a Dutch point of view the sexual orientation of the prime minister being homosexual is irrelevant.
Beware of projecting the weird Anglo-Saxon viewpoint on sexuality and sexual orientation onto events taking place in a Dutch context.