Evidently, he did not know who you were and that you don't take kindly to such disrespect.
He will go through life having no idea how different his fate would have been if moods were a tad less kindly.
A friend of mine (in his very early 20s) had to call him up and tell him to back off his girlfriend. Then it apparently turned into something of a life/morality lesson with this friend of mine telling him, "Samir, you have to grow up, you are a Mr. Olympia, this is no way to be living" and then Samir agreeing with him and saying he was going to work on getting his act together.
Must have been a hilarious phone call, some kid from Oklahoma fresh off the bus in Golds Gym giving a Mr. Olympia a heart to heart talking to about shaping up.