I saw one in the post bar. What does this mean?

Virtue, Yi, Man and Rong are all appellations for people outside the Central Plains. From these appellations, we can see how superior the Central Plains people were at that time. This sense of superiority has persisted for thousands of years until now.

Although China has been beaten black and blue by these despised people, the attitude of despising people has never weakened, which is a kind of morbid state.