Scares me that 90% of replies here are essentially "go to the CP and refuse to play ball". What about simply talking to the individual? I'll bet most people are reasonable when they are told in a professional manner, that their behavior is not acceptable. Of course, a little tact in presenting this may help.
The fundamental lack of people skills should preclude a person from entering a multi crew cockpit. The person in question may not at all be aware of your feelings about him, and he will probably be thankful - at the end - for you bringing the matter to his attention. After all, the desire for approval is one of man's most fundamental needs.
(A book that everyone should read, that has given me a lot is the 1930-classic "How to win friends and influence people" by Dale Carnegie - google it!)