The guy is obviously one angry little twit.
Best advice is ignore him completely, and put pedal to the metal and get going. You can't argue with idiots. Never works, especially with angry idiots - I assume this is Rhyl centre.
Difficult I know, but it is your age - just let it go. They aren't going to take any 'response' from a young lad. I keep saying this but young lads are hot heads - I was one once.
You did right to head for the police station.
I was nearly run off the road by one angry V5 Golf driver - only because I stuck my arm up at him (no fingers) - he chased me and swerved at me, and I'm over 12 stone and (was) 40 ! He only buggered off after I said I had his reg. The police took it seriously, paid him a visit, but because it was one word vs another, they could do no more. What happened though was they put 'more' intelligence onto the car - the officer told me it had 'history' for poor driving and if I reported it they'd get more - so when he really caused a problem, they'd have him. So no need to argue, just report them. Words like intimidating, feared for safety etc help (PS the officers will help you with the 'correct wording').
Report it, I recon the car has a 'history' already.