Abusing Rep system on Xbox 360?

Ok so the other day I was playing FFA on MW2. A guy on there was telling myself and few others who joined the lobby that if we hate losing we should leave because no one can beat him. The match started and i got my Predator which lead to my Attack Helicopter and last my Pave Low. Soon after i died and did it again. I ended the match 30-6. The closet person to me had 13 kills which was the guy talking trash. I check my Rep periodically which i did later and it said some avoided me because i was unsporting. The guy had told me he was gonna put a bad review on me. Just because he lost? Well everyone laughed at him too. How many people has had this happen to them and whats your thoughts?