Hmm...so you say that he is NOT a guy that you can reason with yet you left him a note on his screen to piss him off. Since you dont drive a crappy common Beamer, instead an individual and unique supra, its very easy for a low life piss off bafoon like him to key YOUR car or slash YOUR tyres....
There are clearly two options only.
- Either you be the agressor and hopefully he isnt up for a fight, but if he is, then you have to be prepared for a proper brawl.
- Or, just let it be, its only a parking space, you talk about principles yet refer to him as an "arrogant, abusive and poor at driving as you quite clearly demonstrated today" - why the hell would he care about being the nice guy...?