When people put a lot of care into maintaining their yard, what often happens is that they start to feel protective of it. That's natural to some extent, but it's surprisingly easy to go overboard when dealing with those who leave more than footprints on their way past it.
I can recall having to talk down a couple of folks when someone's dog pooped on their lawn. After all, I couldn't see too many ways that their plan of throwing the droppings at the owners would end well.
That's the kind of hard lesson that it looks like one Virginia man will need to learn on his own.