"A Dutch friend says I should use Holland as an example of a tolerant society. It's true they have a long tradition of comparative open-mindedness. ... And yet, I wonder. The Dutch seem to live their lives up to their necks in rules and regulations. There's so much you can't do there; is there really nothing you can't say?"

The reason for all their regulations are likely, that they live very crowded. The closer people live together - the more rules they come up after a while, to keep things somewhat stable.

Otherwise there are of course plenty of things you cannot say in holland, if you don't want people to be shocked.