It was a boob...transmitted during an event that the producers knew would be watched by many children...exposed in a simulated act of assault. It's not like people are saying, "How dare they show a woman's boob on Howard Stern's TV replay at 2am?"
I'm getting some enjoyment out of the selective outrage, too, but get a grip man. People are mad because there were little kids watching and because MTV et al is treating us like...well, like a bunch of boobs.