The racial slur of the day is Kwai-lo.

It is used to refer to Whites.

Deep lore: Literally meaning "Ghost person/guy". In Cantonese, it's "guih lo". Somewhat popular...used to refer to the presence of British people (whites) when China and Britan were at war, towards the end of the 19th century, and the beginning of the 20th. Can be insulting if said the right way