Like others have said, I’ve learned to hold my tongue when it comes to making an assumption. I watched a woman pull into a handicapped slot that had no sticker or sign. This was at a strip mall where even the furthest parking spot isn’t that far away, especially first thing in the morning. Then she pulled out a crutch from the trunk/boot of the car. When we were both settled in the dentist’s office, she said, unsolicited, that she just bought a new car and didn’t have a new sticker yet. Maybe she saw the initial look on my face and that is what caused her to mention it.
For me, this isn’t worth bringing up with a potential abuser. It doesn’t seem to happen that often, we are more often wrong than not, and I doubt that anything a stranger says to the guilty will change their rationalization process.