What is a bad guy?

What is a bad guy? Not well defined. You can take it as a naive question, or you can take it as a philosophical one. In the eyes of children, the world is black and white. But in the eyes of sages, it is different. "Everyone can become Yao and Shun", this is the famous saying of Mencius, but Xunzi thinks that human nature is inherently evil. But whether it is inherently good or inherently evil, we don't have to get too entangled, let's start from the simplest, from the perspective of human ethics and morality, to see what a bad person is.