The writer of the article is treating child rearing as if it requires PhD level child psychology. It doesn’t.

A child’s behavior is almost always ok if it is safe, non-destructive, legal, and NOT OFFENSIVE TO OTHER PEOPLE IN THE SAME SPACE. It doesn’t even matter if the other people’s idea of “offensive” seems reasonable or not. If their children are bothering others, a responsible parent will either curb their behavior or take them elsewhere.

The writer apparently doesn’t understand that last part.

History classes in the US cover WW2, but barely touch on the causes of WW2.

Swear words are special words, that you shouldn’t use just any fucking time you feel like it.

That’s wildly inaccurate, even as a rule of thumb. Upkeep (excluding storage, which varies widely by location) shouldn’t be over 10% of the purchase price, unless the boat was really cheap or the boatyard doing the maintenance is crooked.

Talking US rates here, I have no experience overseas.