If you're able to drive a vehicle legally, you must at some point have passed a driver's test. During that test, your understanding of the various signs, markings, and other common instructions you'll see painted on road surfaces will have been examined. Either this person has forgotten all about them - and therefore needs to be tested again - or they simply don't care. That's why they think a clearly indicated crosshatch pattern is actually their own VIP parking bay.
We salute how extra the person who's taken revenge here is. Who drives around with colored chalk, waiting for the ideal moment to strike? As this driver obviously believes they're above the status of us commoners, our revenge artist has decided to highlight their 'Princess Parking' bay, so nobody else steals it. How thoughtful of them. Just for the record, not even the British Royal Family would be allowed to park like this!