User attempted to kill you because you called him a retard. This action is unrealistic and he also did not take into account that there are numerous NPC's within close proximity (Gas station, able to see and hear; and the car dealership which could hear the gunshots directly next to them). He also ran away from you while you were gun pointing him, proceeded to get into his vehicle and then continued to drive while you held a gun to him, after you shot his vehicle, he continued to run away until he stopped shortly after.
I believe that with this evidence provided, this user deserves a 3 day ban from the server. You have my support.