Your parking stinks
Some people love the faux-fresh smell of car air fresheners, and other people hate them. They have a strong scent that not everyone’s a fan of, but we can’t say they aren’t useful. The person who wrote this note must be a big believer in those car-fresheners, and he used them to teach someone a lesson.
This person went the extra mile to make their point and gave a bad driver a car-freshener. That way, if they do hang it in the car, they’ll think about this moment and hopefully park better. To emphasize just how much their parking stinks, he gave them an air-freshener. That’s a bit harsh, but hopefully the owner of the car was able to laugh about it as we did.