I want to make a statement. I'm not racist. I love black people! I would even purchase one myself.
Slavery is a very sensitive subject so making jokes about it will upset people.
It's not a serious thing. I just wanted to reflect how blacks are lowly treated in the context of slavery history.
It is a serious thing. Slavery was a tumultuous time in the past and the effects of it are still present in society today. It is not a matter to joke about.
I'm joking. Calm down. I didn't mean any harm to anybody.
But you are harming black people by making jokes about them and slavery. It is not right to think or joke about black people and them being of low status. It will make people think that you are racist.