Let's go the other way around, how many words that might sound bad, in how many languages, exists in all the codebases. And now, how many people feeling bad about this I have to find to make change to some code? I know that sounds ridiculous, but I want to say, hey where's the limit, should we all speak using some machine - neutral words?
And another argument, what if that kind of change could brake my project, do somebody care about me?
What word will one replace "slave" with? Should we go to the origins of the word and just use ethnonym "slav" instead? After all it has only positive connotations {The word slovo ("word") and the related slava ("glory, fame"...}. And sure slavic people won't mind right?! /s