Well... Door dings are my pet peeve.
The second most expensive purchase most people ever make is their car. The wanton disregard of another person's property really chaps me too! I have resigned myself to parking in the most undesirable, and usually most distant, parking slot and seek out the ones where only one side of my car might have a car park beside me and like you, meticulously avoid contact with other cars.... My second pet peeve is folks rubbing against her or dragging a purse against her...more disregard.
That said... Cal a spade a spade and walk away... The dental bills etc. will eat the money that could be needed for the repair.