That's certainly a valid point, but where do you draw the line? Is it okay to berate stadium staff because you supposedly pay their salaries? Or is harassment only acceptable towards the players? Booing is within the context of a sporting event. Booing an usher isn't in any context that is regarded as acceptable. Part of the game is cheering and jeering players. Cheering and jeering stadium staff isn't what reasonable people would deem part of the game. So long as the people booing don't interlace it with publicly unacceptable behaviors, such as profanity, etc, there shouldn't be an issue. The real question now is what to do with opposing fans? That is, where is the line between jeering a fan booing your team (or cheering for the away team) drawn between "game time fun" and disorderly conduct? I'd argue that when watching your home team, jeering an opposing fan should be considered acceptable. That is as long we nothing is a direct personal attack, lewd or profane, etc. For instance, yelling at a cheering Cubs fan to go back to Illinois is acceptable. Calling them a FIB is probably borderline, but could be framed in a context that is either acceptable or clearly not, and swearing at them or publicly debating their apparent weight problem is probably off limits. I guess the theme is context. Jeering players is almost always within an acceptable context. Jeering opposition fans has a lot of gray area. Jeering stadium employees is almost always unacceptable.