Hey, maybe the white dude feels icky about the master/slave thing. Maybe it's not about the opinions of black people but words we want in common usage in our societies.
Is the intent to completely remove the terms? That's a new angle I hadn't heard. I guess it makes said guilty feeling persons life easier, as they can't hear about the currently happening slavery in the world and can continue on their merry way.
The point is to correlate the word slavery with the concept of human slavery only. Disallowing a word to be used outside that usage is better for everyone.