The thing about humour is that it's supposed to be funny, or at least amusing. The "sex and the Swiss" remark is simply stupid and offensive however you look at it.
Actually, I am reminded of a remark along those lines that manages to be more successful; the writer George Mikes once remarked that "continentals have sex lives - the British have hot water bottles".
While a bit off-color, after falling asleep while listening Brun's music I think it was a clever way to describe what I heard. Stupid is probably a word I would have used in grade school.
