It upset me. I don't like to see lying defended. I would react about the same way to an equally cogent "Defense of Pickpocketing" or "Defense of Throwing Paint On People", though I imagine those would be much more difficult to construct.

I knew you were a deontologist (I am a cosequentialist), but I had sort of assumed implicitly that our moralities would line up pretty well in non-extreme situations. I realized after reading this how thoroughly alien your morality is to me. You would respond with outrage and hurt if you discovered that someone had written a defense of throwing paint on people? Or pickpocketing? Although I have never practiced either of those activities and do not plan to ever do so, my reaction is totally different.

Pickpocketing is a perfectly practical technique which, like lockpicking, might be used for unsavory purposes by shortsighted or malicious people, but is probably worth knowing how to do and makes a great party trick. And throwing paint on people? Hilarious. It's not a terribly nice thing to do, especially if the person is wearing nice clothes or is emotionally fragile, but I think most people who can compose a cogent philosophical essay can also target their prankstering semi-competently.