We call everyone who looks Asian Chinese. That's what I meant.
Why would you refer to them that way?
I mean basically all of them looks the same, so who cares? I don't know any other countries in Asia.
Imagine if a foreigner insisted on calling you Italian or Russian, or some country that was unrelated to your ancestry.  At best, you would find this offensive, so you shouldn't do the same to others.  It is easy to learn about the countries of Asia, and if you want to know, you can just ask someone where their family came from originally.