What you posted seems to be pretty much in agreement with what I posted earlier.

Yours states "the amount of the tip is also critical. A 5% tip will do nicely for good service."

What many do not understand is the part it of where it says ( a larger "tip") can "be treated with disdain". = "ugly American".

If one is not in North America maybe one should do as the locals do. Not what one is accustomed to at home.

As I said earlier, the French do not tip in the American sense of the word, they leave a "pourpoire" which is a much smaller amount.