[BlueBear]

It is human nature to be stubborn. Even people with higher degrees will refuse to succumb to the logic that third base play doesn't matter. They remember the times where the third base has harmed them, but they will forget the times where the third base player has helped them. Psychologists call this selective memory.

I would explain that the player in third base can equally either hurt or help you, so it doesn't matter. If that unchallengable logic doesn't make him change his mind, nothing will. Alternatively, just let it go but if you insist on making your point, just show him this thread.