Slavery operated in the first civilizations (such as Sumer in Mesopotamia, which dates back as far as 3500 BC). Slavery features in the Mesopotamian Code of Hammurabi (c. 1860 BCE), which refers to it as an established institution. Slavery was widespread in the ancient world.
https://en.wikipedia.org/wiki/History_of_slavery
Racism and prejudice are part of every society and culture on our planet, as it always has been and always will be. Have you ever seen a Chinese person interact with an African-American? Or how a Chinese person treats a Taiwanese Person? or how a Chinese Person treats a Japanese person? or the way Chinese people treat literally any living organism?
If you truly believe that only "white people" can be racist then you are simply a bigoted moron, hiding your racism behind your conformist attitude.