I think it's another case of the French being congratulated on something which isn't at all widespread in France, and which also happens elsewhere, though not invariably. We had a running joke about French Women Don't Get Fat - as we walked the streets of Rouen, we decided that many Belgians must be in town for the day.
[Puffs out chest...] I've actually been congratulated MANY times by the French themselves on my children's politesse in restaurants, and sometimes asked for advice on how to achieve it. The dumbo in the Times with the toddler who misbehaved in the restaurant made me want to pull my hair out. She could have brought a book to read aloud, or a small toy, or a drawing pad and crayons, or all of the above. Why were the salt cellar and the packets of sugar within the child's reach? (And don't even get me started on the people who take three kids onto an eleven-hour flight without giving a moment's thought to how they will keep them entertained. No, the seatback entz WON'T DO IT.) IN other words most behaviour meltdowns are due to bad planning.
Should I publish a nice arrogant bossypants book called People with Half a Brain have Well-Behaved Children?
Oh. Thought not. 