Interesting Freakonomics Podcast (beginning at 28:00) from a few weeks ago, discussing booing at sporting events, art, and politics. It had some interesting tidbits that I can use when I return to writing on the subject.
One is that the Colonies brought over from England the concept of "audience sovereignty," which vested in the audience the right to boo and jeer political speakers--precisely what Alexander Meiklejohn eliminated from his theory of the freedom of speech. The second is the story of Johnnie LeMaster, a light-hitting shortstop for the San Francisco Giants. In 1979, LeMaster made some comments opposed to gay rights, causing fans to boo him continuouslys. After several wrrks LeMaster had a jersey made up with "Boo" on the back and wore it for a game, which immediately won fans over. And third is an interview with former Pennsylvania Governor and Philadelphia Mayor Ed Rendell, who talked about booing, especially when politics intervenes in sports.