When was the boundary breached?
In the Roman Colosseum, when the plebeians turned their thumbs down? At the 1936 Berlin games, when Hitler snubbed Jesse Owens? Or last Friday when the Detroit Pistons, Indiana Pacers and the Detroit fans brawled at Detroit's Palace of Auburn Hills?
An athlete must be able to withstand the slings and arrows of a fan's remarks, and even a beer shower. No matter what happens, you just have to suck it up.
Bounded by the team bench, the athlete has no place in the stands.