I want to say "I don't %&*! speak Creole" In Creole to people who think I look Haitian and start speaking Creole to me at work. is there a mild Creole cuss word I could use in there that won't offend people too much?

The whole point of cussing is to offend.
In my opinion, you either offend or you don't.
There's no halfway zanmi :)

Ask me anything