The "master-and-slave" thing was mentioned in that MetaFilter discussion I linked you to, by the founder of MetaFilter no less! He talked about how a friend of his did find the terminology offensive, because he was black, and about how upon further consideration it was pretty easy to see why such terminology was offensive.
Does it bother me personally? No. But knowing that it might bother somebody else gives me pause, because I like to consider other people's opinions and emotions. It is not super hard to do! Listening to people is even easier than talking, all you do is stop opening your mouth for a while.
I appreciate your unnecessary sarcasm, Mr. Welch, but I'd like to ask you in turn why it's so hard to consider things that you do that might bother other people. Or to consider the very simple notion that some things are well and good to laugh at, but that laughing at other things dismisses and belittles serious issues that are worth not laughing at.