Weeelllll. You know. Maybe don’t argue with them. Private property does not matter. Laws don’t matter. At this point you basically have two options:

1. get your shotgun, point it at them. As soon as one draws their gun, you shoot.
2. stay clear of them. If they say “back up”, you back up. It does not matter at this point who is lawful and who isn’t. If this is going to the court, no matter where, chances are that you will get indicted for various reasons and your case looks automatically weak as fuck. So just film everything, give them space, tell them to get fucked and off your property, press charges afterwards.

Stick to one of both plans. Everything else is useless.