I don't get the passive agressiveness. You are a cop - why not issue a ticket or warning for a loud party and break it up as soon as you heard about it. If you were on duty until 2 a.m. and were able to drive by your own house to take care of the guy parked in your driveway, why not disperse the whole thing then unstead of going home later and calling different cops? Is there a conflict of interest issue with writing tickets on your own neighbor?
....................because I'm not going to confront 15 drunk dudes at 0245 in the morning about loud music, probably wouldn't go well.
Isn't this something you do as part of your job anyway, and that you could have done on duty just an hour earlier (or sooner since you were in the neighborhood anyway)?
And in the OP, you talk about selling your house to get away from this guy, the day after he moves in. To paraphrase Michael Bolton in Office Space, why should you have to change, he's the one who sucks! You have the intelligence and authority to stand up to this bozo, just do it and put the kibosh on his shenanigans.