> Would you hesitate to say that expression without knowing that coworker's background?

Ok. But. The discussion is about specific expressions almost everybody knows, not just random words. One of those words is `slave`.

> It looks to me more sensible and a better long term solution to help this person to deal with his/her emotions instead of trying to change everybody around them.

I think this only applies to situations in which one specific person has specific triggers who are e.g. tight to an psychological trauma...