If you buy a property knowing full-well the adjacent property owner is, and intends to continue to be a major jerk, at least you'll know who got you into that mess.
See, this makes it even worse.
My uncle made an unsolicited offer, to me and my brothers, that he would purchase a piece of hunting property.
He asked that me and my brothers take over the property taxes and insurance. We would have immediate use, and our uncle said he would put our names on the deed so it would be ours when he goes.
I don't want to look a gift horse in the mouth, but I also don't want him spending good money on a bad property.