Don't see what difference this would make.........
Was he driving it at the time???
If someone came into the pub and said he's clipped my car it wouldn't make a whit of difference how much I'd drank, I hadn't done anything wrong. In this case you could be the only one who had done anything wrong..........
BTW, how did he know that you'd clipped his car if he was in the pub???
Maybe he heard it...........