I was on a flight once, guy beside me was.....large. His arm was resting on me. This started right after takeoff. I just said " dude, you can't rest your arm on me the whole flight". I was not over the top, just a declarative comment. He moved his arm and tried to keep it off me the rest of the flight. His size was such that it was hard, he wasn't trying to jerk me around. Your person rose to new heights of rude.