Write an idiom related to Yelang and talk about its meaning

Yelang arrogance (pronunciation: yè láng zì dà), an idiom, refers to the superficial conceited or arrogant behavior of pride and ignorance. From "Historical Records·Biography of Southwest Yi": The king of Dian and the Han envoy said: "Which one is Han?" "Are you bigger than me?". The same goes for Yelang Hou. Because of the incomprehensible way, each thought he was the lord of a state and did not know the vastness of the Han Dynasty. "Yelang is arrogant" is one of the idioms with the highest recognition rate in the Chinese circle, and all Chinese reference books interpret it as an opposite. It is an idiom of an arrogant person. It is through this idiom that many people know that there was a Yelang Kingdom in the ancient southwest.