Is this so unbelievable? Maybe he doesn't really understand the rules- a lot of golfers don't.
If he was playing in the format that he says he was, I highly doubt that he doesn't understand the rules. I don't know all the rules, but I know the major ones. Also, in these days of cell phone tech... it's very easy to pull up the rules, right then and there.
Having said that, You might be right and I just came across like an ass. It won't be the last time.