In 10 years of camping, I've never run into that, but we stay exclusively at state parks. Th CG host will usually handle these things and if he/she gets some lip, the ranger is called to toss the a-holes out. If necessary, they call the rangers with the Red/Blue light bar on the truck and a shotgun in the front seat. These boys/girls are packing some serious heat and have arrest powers like normal law enforcement so few will mess with them, and if they do, it's at their peril. In private cg's you could very well be on your own.