Why did Jiu-Er stick out his foot in Red Sorghum?

Jiu-Er is not a woman bound by feudalism, but a provocation to feudal society. When the TV series "Red Sorghum Car" stopped, Jiu-Er's foot stuck out. You should know that China was in the 1920s and 1930s, and women's feet could not be exposed, while Jiu-Er was just the opposite. Obviously, Jiu-Er is not a woman bound by feudalism, but a provocation to feudal society.