Oh, I see that there are differences in humor between EU and USA.
The joke is twofold. 1) When you visit a foreign country on vacation, you want what you buy to reflect that country (It is false if it is made in another country). I also thought it is wise, not only to reflect on what you buy when you are abroad, but also when we meet other people. Sometimes we do not find the same inside a person as what is on the outside. Vulnerable persons have to remember that .... (and that is serious, not funny).
2) Samsung mobiles are, as far as I know, produced in the city of Seoul, not in China. Here in Europe, some people buy cars made in China. There is nothing funny about that, because there are many who are afraid that if it comes to a war, China has electronic powers installed that they can use to take control over the cars (Crash them). China denies that.
All in all, I meant, check both inside and outside when you are to enter a close relationship!
A joke with a serious meaning!