The economy has been bad in the past two years, and a large number of people have lost their jobs and are under great pressure in life.
The Han people will not gather together to cause trouble unless they starve to death, but they are very good at stabbing the people around them.
So be polite to others outside, say thank you when you should, don't hold on to others even if you are right, and don't be unreasonable, because it is very likely that a few words from you will become the last straw that breaks the camel's back and stab you with a knife.
Building a harmonious society together starts with you and me, and starts with small things.
When I deliver takeaway to you, please say thank you to me, so that I won't stab you