The most annoying way that bad parking can affect you is when it stops you from being able to move your own car. Everybody knows that you don't park in front of a driveway. That little dropped bit of curb is there to help whoever owns the driveway get their car in or out of their own property. If you park there, they can't do that, and you're going to make them very angry.
The owner of the blocked driveway took the time to helpfully remind this ignorant driver how parking is supposed to work, with a dialogue to make sure they got the point. Interestingly, there are also instructions about how to take a shower. Are they implying the car is dirty, or the driver? If it's the driver, the insult is probably a little below the belt - but then you're asking to be insulted if you trap someone inside their own home.