I would call the Game Warden and tell him that not only were guys openly saying they were going to trespass but also threatened you. I am not one for lawsuits and calling the cops on small things, but this sounds like it could be nasty.
I agree, at least they would know that someone is trying to give you a hard time.
But if this crack-head thinks this will work and he and his buddys will be able to just show up and hunt.
"I don`t think so"....