Comedic ethnic stereotyping is not endemic to the USA. It is a worldwide phenomenon that has been in practice for thousands of years. It is not an act which in and of itself constitutes "oppressive" racism.

What about Asians mocking each other's accents? The stereotypical depiction of Japanese in Chinese comedy is the same as it is in American and European comedy. The stereotypical depiction of Chinese in Japanese comedy is the same as it is in American and European comedy.