What's the name of the person who makes himself a joke?

Clowns, clowns originally refer to people who perform acrobatics and grandstanding, but now they also refer to people who are grandstanding and unhappy in life on the Internet, people who are self-satisfied, "people who have a huge contrast before and after, people who feel ridiculous, people who operate funny games" and so on. And it is often used to laugh at yourself or others.