The thing is, the fans were upset because there were two cases where an ump made a call, someone protested, and then all the umps gathered together... and made the right call, reversing the initial decision. In both cases, the call was right, based on the instant replays that we saw at home. Presumably, the fans didn't see 'em... and since in one case a Boston triple turned into a Home Run (making it 4-0 Boston rather than 3-0) and in the second case changing an error letting the runner at first score and leaving another on first (making it 4-3, with one out) to an out by interference by a base runner (making it 4-2, two outs, runner at first), you can understand the high passions. Throwing stuff, though, that's just wrong.

Of course, the fact that I'm a Red Sox fan might bias my opinion slightly :-)