How to explain to foreigners the cultural habit that China people like to treat guests and pay the bill?

Because people in China are very face-saving, they say that I will come when I come, thinking that it is better for you to come. Unlike Americans who go out for dinner and go shopping with AA, Americans are very direct. They can say whatever they like. If they like a girl, they tell her I want to have sex with you. Of course, they don't really want to have sex, they just express their love for each other. How can I put it? Every country has its own traditional cultural habits. Of course, we China people don't like to pay the bill at birth, but we live in this big family and are unconsciously involved.