My favorite hobbies are golfing and hunting, but I would forego both this year if you paid me $30,000. You can both enjoy an activity and at the same time forego said activity for the right price. Now, I'm not claiming he's erected this fence for any reason other than to get his $450,000; however, it is his right to do as he wishes with his property. The homeowners can either put up with his pink fence, or pay the $30,000 to buy the property and tear it down.
He may be a jerk, but that doesn't entitle others to violate his right to do as he wishes with HIS OWN property.