How stupid can you be? Maybe if he would have backed off and followed traffic rules he would have become just like any normal person and seen reason instead of being a total douche. He is obviously at fault.
You can't even argue against it in the UK, even if the person driving in front breaks for absolutely no reason it's always the rear ender that gets blamed.
This is when a dash cam comes in handy. Some guy posted a video online, a while back, of some guy stopping in the middle of traffic, and then backing up into the guy behind him. The driver in the front got out and started ragging on the driver in the back until the driver in the back told him he got it all on video. He then started to apologize and try to say there was no damage done so it was all good. Haha! Almost makes me want to get one.
He may be an ass, but youll come out on top for this one :)