Based on very little info about this specific situation, I'd say, "Good luck." I can only say do your best to get along with him- whatever it takes. Everybody has something that you can do to make them happy. If he is as bad as you say, he'll be dealt with in some way. It may take several years, or so. In the mean time, don't let him "ruin your day". Don't lose your job, or mess up your life, because of a temporary situation. I was flying F/O for a small company and they hired a DEC who not only did every dislike immensely, he was unsafe and incompetent. Stories about him were constanly going to the bosses. He was hired as a Capt, he was considered a Capt, he was treated as a Capt- all by the company. Not by any of the pilots- Capts or F/Os. Ground/dispatch personnel ridiculed him regularly. It took about 5 years for him to finally be moved out. And it was done in a way to make him look good. You don't think the company is actually going to admit they made a mistake, do you?