You can't be mad at someone for fucking up your shit, after you fucked up their shit. No matter who started it. You could have handled it after they did it, but you didn't. It turned into a big kiddy game. And shit kept escelating until its at what it is now. Breaking the window was definately a bitch move, but come on, what did you expect? That they would laugh when they saw their shit all fucked up? As I see it, you got 2 options....1) deal with what you got because in some manner you provoked it or 2) go and kick their ass for fuckin up the window and your car(s).