First of all, there is not enough mutual respect between people in the daily life, they don't apologize for touching each other on the road, they don't apologize for queuing up and grabbing a seat, etc. They are indifferent to people in the daily life. Indifference to people is a daily state of affairs, and I don't think it's a bad thing
Many people still discriminate against service professions, for example, when we say "hard" we mean "bricklaying" or "miserable" we mean "street sweeping". The service industry was once a lower class job, and to this day people still intentionally or unintentionally look down on these workers. They can feel this attitude. Naturally, they will not give you a good face.
You mentioned the poor service attitude of a **** the same point is that they are hired leaders just let them work can not stop wages are not high live a lot. They are penalized for doing a bad job and not rewarded for doing a good job. Even if they do more, the customer just nods and walks away. They have no incentive to smile at you.