Derek Jeter finally broke his slump last night, but not before we all had to endure the appalling spectacle of him getting booed at Yankee Stadium. It seems to me that there are only three circumstances in which it is appropriate to boo: 1) when an umpire makes a bad call; 2) when a player on the home team is obviously not hustling or thinking on the field; 3) when a villain from the opposing team, say Manny Ramirez, creates any opening for some good-natured abuse to be heaped on him. But just booing a player for being in a slump is totally classless.