Is the wimp you are forced to fly with in with management? In other words can he cause damage to your career in that airline if you object to his frightened attitude? If he has that hold over you, then you have two options. Either settle on an appeasement policy or find another job. If he is just yet another twitchy pilot,with no serious management contacts, tell him to pull his head in. There is a time for touchy-feely no cockpit conflict under any conditions and another time for firm captaincy on your part.