For the original poster, yes, your wife is gonna be mad. But your son may be really proud of you sometime and remember when his dad threw down with some %$^%%$ and ran him off.
You have to keep standards, and if everyone lets Mr Bike Wanker be the anti-social guy then he’s not gonna learn. Yes the fight may have been a draw (spend some time in the gym learning how to box maybe), but Mr Bike Wanker may think twice next time. You may have saved someone from an accident.
Just sayin’.