Site squatters

We had a similar experience at an RV park in New Mexico. We had made reservations, and my husband had checked in at the office, but when we got to the site they gave him, there was a vehicle parked in the middle of that site. The tag was from the state of the RV parked next to our site. My husband knocked on the door of the RV and asked the man if he would move his vehicle from the site assigned to us. The guy was rude as he could possibly have been and hateful to boot. He refused to move his vehicle from our site, so my husband suggested they walk down to the office. They did and the lady walked back with them. She told the man he had to move his vehicle so we could access our site. He did finally move it, but he was fuming and yelling. He was also intoxicated.
I worried all night that he would do something to our RV or our truck.
We've never had an experience like that in all our travels.
I was thankful to leave the next morning.