That guy was a little bitch. Three minutes is not a long time to wait for a piece of equipment. He could have done some sissy squats to warm up or something.
First come first serve on weights and equipment.
If anyone can just bump someone else off a pice of equipment, the gym would be hell and chaos.
The cardio area at my gym has a sign asking people to limit the time to 30 mins when there are people waiting, but with 60 assorted treadmills, bikes, ellipticals, and versa climbers, stair steppers, and a rowing machine....that rarely happens.