What do you mean neighbors are anonymous and relatively liberal?
For OP— If it keeps happening after speaking with the dad, confront the kid as he does it. Tell him it was funny while it lasted and to stop touching the car cuz it’s getting old. Maybe get his dad involved as you are confronting him. Teenagers don’t like to be caught and confronted. But if you do it assertively and strategically, without losing your cool, that should hopefully put an end to it.
A reasonable question. I wasn't inclined to get too far into details as it's likely OP doesn't have the option set. However, to understand I need to explain.
In my neighborhood we all know each other for at least 5-6 homes. Heck, I know many more than a block away. We all do each other favors, and we all know who we are and what we, a relatively conservative and at least comfortable area, expect of each other and/or will put up with. Given that level of awareness (so not anonymous), peer pressure would keep dad in line, as would the general understanding that we're all not going to put up with that stuff. Ergo Dad and kid would have a lot more than just me/one of us to deal with. In fact, any one of my neighbors would do exactly as you've said as a first step: Call out the kid, speak with dad, and explain what we expect of each other in our community regardless of who's car it was.
Conservative values (not the political definition) remember? This is a not a town inclined to wring our hands, call the cops, or complain "Somebody do something". I suppose we vote about 50/50, but ain't many folks here confused about handling BS in our homes. We did have a brief problem with teen vandals some years ago. Once homes were being harmed and fires being set it was stopped and the police given some names to consider. No, I don't know how, what, or who.
So now what I meant:
1) Either OP is in an area where neighbors don't help each other, or he's seen as a jerk (which is why I said I hope he's in an anonymous area). Can't change much if the former, the latter isn't something he can change quickly. Either way I'd GTFO.
2) As to beliefs and actions, if the local belief system is "call the cops", and/or "somebody do something" right after chanting "defund the police", well, welcome to Portland. BTW, I know and talk to, heck shoot with, a bunch of area LEO's. If readers think they're gonna address "but he touched my car" folks are gonna be disappointed, dad and kid are gonna laugh at you, and it all goes downhill from there.
All of this suggests this: I don't think in terms of Republican or Democrat (I see good and bad in both parties), but I do think extreme liberals spend too much time in fantasy land and otherwise playing the victim. BTW, for balance I think radical conservatives are just as nuts as the extreme libs.
Yep, I live in a rural state with rural behaviors and expectations of each other. Amen and thank you God.
Anyway, lets avoid politics. You asked what I meant, I've done what I can to explain it.
My best to all,
-d