sigh... this is just a case of semantics
I cant believe someone is even arguing fallacies here. The flaw here is not what someone is saying, but rather how the other is understanding.
The word slave as understood by most people is what gino and masterchief seem to point out while the thread starter is obviously referring to it in another context. The former is interpreting literally (including the words being used), the latter figuratively. This is more of art than literary work.
So in this, no one will obviously win since both have valid points.
I understand both sides of the argument. The first reply was indeed correct. It will offend some who will obviously interpret it differently and we are seeing that right now.
To the critics keep this in mind, by criticizing a work of art, you are actually helping to promote it. So if your goal is for it to be dismissed as merely art and not something more, it might be prudent to keep the criticizing to a minimum. You said your argument, leave it at that.