Wait what?! That's 🦆ing creepy. Regardless of what race the servers are. I'm surprised that exists in 2020. There's no way I'd call anyone of any color a "slave" in any situation. Super weird and uncomfortable.
This was back around 2008 so can't say it's still a thing. But yes it creeped me out and most servers were black. I couldn't believe it even back then but it was a one night thing for me so didn't pick up and march for it.