Not much room for controversy here. This guy sounds pretty obnoxious, but if he owns the land, he has a right to build a fence, bright pink or whatever color he chooses.
Unless he violates some kind of 'code'. Hint, hint.
He doesn't have the right to restrict another's enjoyment of their own property. Clearly the fence is only used to punish those who won't pay him.
in all cases, a hitman is cheaper than a lawyer.
Landlocked parcels are not permitted in any county in the United States. If the man has purchased a parcel that is not reachable by any access or easement, it can easily be condemned by the county.