Modern people think Sao is a derogatory term, but it is not. Sao is just a manifestation of suppressing emotions. Poets used to be called poets. In that era of freedom of speech, they used poetry to express their concern for the country and the people, but they dared not make any noise, but the effect was remarkable.
Sao originally refers to combing or scratching the horse's hair with fingers, and later refers to combing or scratching the hair; Used as a verb, it can be extended to harassment, commotion, sadness, etc.