You want to get over a lane, and the car you’re planning on getting in front of speeds up and prevents you from doing so. Never mind the fact that there is nobody behind them, you’re just not getting in front of them.
You want to merge onto the interstate, and the car in the lane you’re trying to merge onto doesn’t speed up or slow down and makes you have to adjust your speed for them to wait for them. Never mind the fact that there is nobody in the adjacent lane for them to have made the courtesy move into, you’re the one who’s going to have to adapt.
You are in a parking lot that flows one way, and around the corner comes the car going in the opposite direction. Whether they realize their folly or not, they still own it and act as if you are inconveniencing them, when they inevitably glare at you as they pass going in the wrong direction.