"Etiquette, music, shooting, command, calligraphy and arithmetic" are the six talents that the official school requires students to master. Among the six arts, "ceremony" ranks first, which is the most valued accomplishment of the ancients.
Therefore, whether it is a big family or a small family, or a rich boy, everything you say and do should be appropriate. The more noble people are, the more they value etiquette.
Of course, sitting etiquette is also included in these numerous etiquette rules. However, no one is perfect, and if moral norms are deeply rooted in the hearts of the people, they can also be divided into classes. For the poor, eating and drinking is the first important thing.
Therefore, in order to make a living, many people have to smile in the street to attract customers and pick a pole to walk the streets. Although it is to survive, these people are incompatible with the serious social system after all.
Poor men and cheap women. Rich people are educated and disciplined. It is indecent for the poor to shake their legs and laugh.
From a neurological point of view, shaking your legs is not a disease, but a behavior habit, similar to flicking your fingers with a pen. Many people are anxious and nervous, and will make all kinds of small moves to ease their emotions. However, this is not a healthy way to relieve stress. Once they get used to it, it's hard to get rid of it. It is very unpopular to shake your legs habitually in social situations.
Generally speaking, it is subconscious to like to shake your legs, which is often formed in childhood. Some people rely on small moves such as shaking their legs to relieve anxiety, and the result is often that anxiety will double if they don't do small moves.