Please, someone tell us that this receipt isn't what it looks like! The color or ethnicity of whomever serves you should never be an issue. It definitely doesn't need to be recorded on a receipt, either. Even if they were white, surely the customer can see that with their own eyes?
Our best guess is that 'White' is the name of the person who provided the service, but even if that is the case, they should probably stop printing it on receipts. It's bound to end up on the internet, and it doesn't look good.