Nightside, your recent experience brought back a few memories.
One time, I was at home and had put my pony and a couple of goats in the garden to get the grass down. My dogs, who were inside with me, began barking like crazy. I looked out of the window to see a family of four setting up a picnic IN MY GARDEN! They had turned off the main road, driven all the way up the farm track, parked up and let themselves in through the gate. It was obvious they were on private property but they couldn't care less. They had decided it would be nice to eat al fresco with the pretty little critters mowing my lawn and I could go take a running jump!
Another day, I went down the road to pull one of the horses out of the pasture, to find another family just finishing their picnic in the field. What made it worse was that they were attempting to feed my horse their leftovers, including ham sandwiches and a meat pie! I curtly asked them to leave. They ignored me. So I climbed back over the gate and made a big show of taking their vehicle registration. They got shirty about this and demanded to know what I was doing. I calmly told them that I needed it so I knew who to send the vet bill to when my horse got sick from all the c**p they were attempting to feed her. They moved on in double-time, but not without issuing a few expletives in my direction.
The more I see of people, the more I love my horse!!