there is a difference between wishing severe injury or death upon someone you don't know and saying that someone got what they asked for. and class has nothing to do with it.
I would never seriously wish this kind of thing on anyone, let alone death BUT I firmly believe in Karma. and when you do stupid shit like street race or take a 30 mph corner at 80 and your driving skill is not up to the task, you are writing checks that you can't cash. You make these kind of choices you eventually get what you ask for.
TIME will tell if the op learns from this, or uses it for bragging rights down the road it will be interesting to watch.
Agreeing with that guys comment "Stupid ****, you deserved it" is pretty ignorant on both him and your part. You don't know the guy so how do you know he deserved it? He did something stupid, but it isn't something that deserves a punishment such as what he received, it was an accident and shit happens.
On the other hand, like i said though, I don't feel too sorry for him since you know things like that can happen if you take risks like that. He got the shit end of the stick and he better learn from his mistake, otherwise he is a "stupid ****", and it would be fact then.