Parking Lot Road Rage

My family was in the car. We were pulling into a parking space. Some jerk decided to go into the space instead and as he was pulling his car back to straighten it out, he hit us. I laid on the horn, but it was too late. Then he tried straightening out again and he said that it was our fault. I wouldn't move my car until he gave us his insurance and license information. In the meantime, the car next to him wanted to get out of his space and they were impatient so they hit the car next to them on their way out. I was patient through it all, but stood my ground that it was his fault. He back into my door and he had usurped the parking space.