He claimed that most societies(and at least the Western ones I've had contact with match that pretty well) shun exposing sexual organs to children. I don't see why the rage. This is not a controversial comment to make.
Not sure. The wikipedia article is quite interesting.. (1) At least when I was a kid, in Germany, it was very common culture to go swimming in the lake without clothes, and with the whole family. (There was a section on that lake where you had to wear bathing clothes. It was nearly empty.)
edit: Reading on in the German article.. it states that the market for nudist holidays in Germany is estimated to be around 10 million people, 1/8th of the population. Also, Germany seems to be the most relaxed of the Western countries in this issue. The history is quite interesting.
Given that breasts are primarily for small children to drink from, to suggest it is damaging for small children to see them isn't just controversial, it is the height of bewildering and crazy idiocy from someone who must be so unconnected with reality that if they ever accidentally encountered a rational train of thought, they'd probably try to throw themselves under it.