He is objecting because he wants ditches on each side of the road(supposedly but we doubt that too). We know he wants our property, but we’ve made it clear in the past that we have no desire to sell...ever.
If he persists you can get some of the effect of “lawyering up” by having an attorney send him a letter to cease and desist from making unwanted changes to your property. If he’s been there before it won’t make much of an impression. but it’s a start without having to spend too much. It really is best to avoid litigation if at all possible, it can get very expensive.
Sounds more like he really wants that lockable gate. WHat’s he got? A meth lab?