What does it mean that people are not close to money, and people are not familiar with gifts? Who can explain it in a popular way?

It is an old proverb that "people are not close to money, but people are not familiar with etiquette". It means: No matter how close you are, money should be distinguished, and no matter how familiar you are, manners are indispensable. There must be fixed rules and etiquette in doing everything in life. We should not ignore each other's feelings because of mutual feelings and other factors. We should treat each other with courtesy at all times. As the old saying goes in the countryside, "people are not close to money". No matter how good the relationship between people is at ordinary times, they should also know the manners. On holidays, they should not be less polite. As the old saying goes in the countryside, "people are not familiar with the ceremony." It means that the relationship between the two sides is closer, but we must not forget the etiquette. Even if the two sides are familiar with each other before and have good feelings, they should treat each other with courtesy when dealing with each other.