how to deal with new, but arrogant, official?

[Nevadaref]

Set up a scrimmage/practice game/kiddie game and schedule this official to work.
Get the two coaches on board with the following plan ahead of time. You arrange for a time when the official is ball-watching outside of his PCA and then you have two players in his area start an altercation. Could be as simple as having one kid go to the ground holding his face and yelling. Have a bunch of other people holler, "He punched him! Didn't you see that, ref? It was right next to you."

This individual needs to understand why it is important to watch his primary area. Until a severe off-ball situation happens there, he won't grasp the concept.