Let the miserable
do all of the flying. Don't touch anything unless he says. When the numptie eventually realises what is going on, say that you prefer to do P2 when he is captain. Do not start anything in flight. On the ground, walk away if he wants to discuss anything. I've flown with these types and despite all of their bluster, they are the most insecure people you will ever meet. Eventually, you might be able to do a deal (he does not want a call from the Chief Pilot), but don't count on it. Eventually, he'll ask why he is flying all of the time. On the ground, give him both barrels.
People like this are a safety risk. As far as they are concerned they are as close to perfect as it is possible to be. Don't ever fight them in the air. Deal with them only on the ground. As for the resolution, most companies are aware of these people in their midst and would like to see them "reform". With your help, they might.