My dishwasher stopped working recently. I found beating it until it worked would get it back in line.
Is that dishwasher supposed to be a joke about slavery?
slavery is a part of history and it's true that black people have been slaves.
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.