This happened to me in MT when I was run off a piece of state land by four guys that were hunting their "uncle's" land. I think the next time it happens I will pull up the phone and video the confrontation and turn them in for interfering with a legal hunt. I would think that might hold water as it is just as illegal for a hunter to interfere with you as an activist the law was written for. Send the video into the text hotline and see what happens. If nothing else, you have some evidence if it keeps up or escalates the next day.
It's hard to do, but don't let those guys ruin your hunt. The good news is that the vast majority of guys I run into are just like me, out there to have fun and chase animals.