Slavery was abolished because it was unfair. May be this time we should go for white slaves instead and have Slavery 2.0
You want slavery to be replaced with more slavery?
I've never owned a slave, it's just a joke to me.
It isn't good to joke about slavery. Many people were hurt by it and it is rude to treat the subject so flippantly.
Should I not joke about something that does not bother me at all?
I don't believe you should, because it will always bother someone else who does care. Slavery will always be immoral and no one should ever wish for it to happen again on anyone.