I say go for the rule: eye for an eye
Go up and slap him like he slapped your car and say, "b/tch, don't be touching my baby like that!".
My opinion is that you just don't hit someone's car or their family (which sometimes is both).
People like that are stupid, and they'll be stupid no matter where they are or what they do.
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previous name: 84stangLX
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT