I think the point that SHA is making (not to speak for him), is that even if Scripture has been misapplied in the past… It’s not the fault of Scripture. Are you suggesting that any Scripture that has been misapplied is now off-limits to reference? I don’t think you are, but if you follow your point to its logical conclusion, that is where you arrive.
I believe what you are saying is that it was insensitive to use the words, “slave” and “master” to make a point with a black person that is under your authority as his coach… even if you are quoting a Bible verse? You certainly can make a good case for this. However, it’s a shame that we are now at a point in America, where we no longer seem to care what’s in a persons heart… But only that they fall in line with woke speech regulations.