From the sound of it he could have been more graceful about it. Speaking to the manager and thanking him instead of just walking out.

Maybe this guy is such a super genius that everybody will forgive him for being a socially ignorant ass. Those of us mere mortals though should probably learn to be at least a little considerate and not burn bridges wherever we go. People are not robots - they don't like being treated as such even if it is "logical."