ah, I see what you mean - it's an important distinction, and one that I think some existentialists looked at (not necessarily in terms of slavery, per se, but certainly in terms of freedom). Ultimately we can't avoid constraints and in that sense there is always coercion from the environment. However, there is a big difference between those inescapable constraints and the immoral and unjustified hierarchies a tiny minority of humans have successfully imposed on the rest, and pointing that out is definitely worthwhile.

Thanks for the clarification!