Politeness is a part of traditional culture. Invite people to dinner or invite people to dinner and help people do things. It varies from person to person and adapts to local conditions. Only by giving and taking can there be long-term development and future. If you are too selfish to share, you will only ask for bribes. No one likes to associate. Don't treat others as fools. It's just that others don't make it clear to protect their face and don't want to tear their faces, which will only alienate them more.