FUTURE SGT MAKE ME A BAD PROMISE?

I am a soldier of the U.S. Army, Rank: PFC. I'm in Kuwait for my deployment. I just got a roommate, rank: SPC. I do not know why, but he do not likes me, I asked him but he said that i'm crazy, but his action show another thing. maybe because I'm from Brazil (some common friends told me that he does not like Latinos, but this is not my business ) I'm not an exemplary soldier, but I'm not a bad soldier also. I try my best to fulfill my duties. this SPC is supposed to receive his promotion in 30 days, will be a sergeant, and told me that once he gets his promotion he would make my life much more difficult. he's not in my unit, but we're working together (to complete the mission faster and easy). So, now after you know my story comes my question: if he really do what he is promising, is there anything that I can do to make my deployment not be harder than already is? I thank any information.