The only time I have “confronted” another guest was last fall when distancing was being enforced. A family in line behind us was paying no attention to where they were standing, or maybe they just didn’t care. They started off at the distancing marker, and each time the line moved, they crept a little closer and a little closer, until they might as well have been part of my family. It was making me uncomfortable. I finally offered to switch places with them in line. They were more considerate after that.
On a non-Disney vacation recently, a man was going to cut in the line for the rental car shuttle. He and his group of seven (all adults) walked up to the barricade and waited for the line to move and then attempted to through the gap where the barricade ended to cut in front of my then 9 year-old daughter. She saw what was about to happen, and before I could say anything to this man, she swung her rolling suitcase in front of the gap where the barricade met the line so that he couldn’t go in front of her. He was obviously not expecting this from a child, and the expression on his face was priceless! My daughter and I still laugh about it.