Isn't it annoying when your hanging out with your best friend And you end up selling them to slavery
Is you're friend black, is this a joke?
I do not care that black people were slaves in the past. That was a long time ago and it's pointless to bring it up now.
Slavery is an awful part of our history and affect people even today. Making jokes about it can be hurtful. You should consider learning more about black history from books so that you can understand why those jokes can be hurtful.
I have a lot of black friends and they don't care that their ancestors were slaves.
You don't get to decide what bothers them. You should talk to them about how slavery effects them and not just assume.