It's called disrespect. Disrespect is a crime in the history of China, which refers to words and deeds disrespectful to the emperor (such as not avoiding the emperor's taboos). Usually, it is the six evils: stealing the emperor's sacrificial utensils and daily necessities, forging royal drugs, and committing a fasting order by mistake. This is the only death penalty and cannot be pardoned. (The Ming Dynasty was relatively loose, and it was irresponsible for ordinary officials to insult the emperor, at most, they were demoted. Except the Ming Dynasty, other dynasties were harsh, such as the Qing Dynasty. )