"and someone I knew worked for a "master" I might make similar jokes".   First its no joke, Second, to steal from a well known phrase; sometimes its best to keep your mouth shut and have people think you're a racist, than open it and remove all doubt.  Racists seem to think they can hide behind "jokes", but those who are not racists actually believe, deep in their hearts, that there is no room for such jokes.  "Joking" is just a way to justify the racists remarks.