You don't have to go all-out on telling someone that they don't know how to park properly - often, a single word enough, so long as you put it in the right place. In this case, that 'right place' is right across the hood of a vehicle, in giant letters. It's a simple method, but then you'd have to be a little simple if you thought that it was acceptable to block off access to the sidewalk like this.
We're a little curious about what's been used as a substitute for ink here. It's definitely brown. We think it might be chocolate sauce or syrup - not the kind of substances that you want to come into contact with your paintwork. If you're going to park like an idiot, though, you deserve to be called an idiot, and you can't really have too many complaints about the method that people use to inform you.