This is getting ridiculous and annoying.
When I hear about slavery, I think about the poor people that did not have any freedom, not about black people.
There have been african slaves in africa, asian slaves in asia, european slaves in europe and native american slaves in native american civilizations for thousands of years.
American people are projecting their very own and specific segregation problems onto the whole world by banning words universally useful.
Forbidding vocabulary like this only reduces the quality of debates on the long term and does not make anything better. That is how dictatorships works.
If you cannot say the words "slave" and "master", you cannot have a discussion about it, its history and influences on our society and on real people, because otherwise you would be deemed racist.
In my country it became racist and implicitly forbidden to say "black people" or "arab people" because otherwise you are instantly deemed to be racist. So now we cannot talk at all about this topic. Politicians certainly won't risk their career by talking about it. So nothing changes, and nothing can actually improve (including the lives or people living today), because we cannot talk about it...
I will continue to use words however I want.