Lots of interesting points. I see some people prefer the ancient humour form of name-calling to that of the patronising joke. The patronising joke requires I think a mixture of liking and a sense of superiority, rather like patting an older person on the head in a friendly manner.
I do of course know there are many people of Scots extraction in the USA, and that they have to keep calling themselves Scottish because there is no other country name available to them. Every other American country has a name, but the United States only possesses initials, and its citizens must call themselves by the name of the continent rather than Usans.
How sad. As if people in Scotland could only call themselves Europeans, because there was no name for where they lived.
And over here a cowboy is someone who does a shoddy job with poor workmanship. How that got derived from the honourable trade of cowpunching I do not know.