An argument? Could have been a perfect opportunity try out an "As you wish Sir" or even an "I stand corrected Sir. How can I make this up to you?".
You could have tried it on for size, and got a look at his reaction too.
(if the situation was appropiate of course)
Sometimes it takes sprinkling a little submission dust in the air to bring out that inner Dominant you are lookin for.
Cheers,
Twisted