I got a note like this once (minus the condom). When I had parked in the morning, there was an inch of snow on the ground so I could only park a reasonable distance from the person beside me. By afternoon, the snow had melted and the lines were visible. Sometimes people are just looking for a reason to be mad.

The most polite people I know are also the most willing to stand up against wrong doing when the time comes. They are they way they are because they value good prosocial behaviour, they’re willing to sacrifice their own convenience for it, and they’re willing to defend it.