atpsr22 you already know that safety has to come first and as we all know the cockpit is no place for a personality conflict. I think you have to atleast sit down one on one and talk to the co-pilot first about the safety issues. If he is not willing to listen and learn then that says alot about him as a person. If the owner is not willing to listen about safety concerns then do you really want to work for someone who does not believe safety comes first. Nobody can tell you what to do but always remember no matter what you do in life do it for one reason, because it is the right thing to do. Good Luck and be safe.