Re: Ah, but ...
"I always thought that quote was from Mark Twain."
His real name was Samuel Langhorne Clemens.
My recollection of his travels in the world is that they often gave him the opposite conclusion. Which I paraphrase from my experiences as "Travel narrows the mind". However - don't quote me on that.
For many nationalities the ones you meet outside their own country are atypical. They are often the ones trying to escape some conservative parochialism. (There are many exceptions though). When you live and work in another country it is often a see-saw emotion of like/dislike of aspects of the actual culture.