Why does China culture always require girls to be docile and obedient?

Because virtue is the traditional virtue of China.

The traditional virtues of the Chinese nation, such as diligence, virtue, forbearance and filial piety, are worthy of our inheritance, but the filial piety of all virtues is the first.

A gentle woman is tolerant of everyone. They are very modest and considerate of others. They will always think of others and never embarrass others. Never fly into a rage or fly into a rage when something goes wrong. Mild steel is the highest realm of women. At this level, even if it is tempered into steel, it can become a soft finger.