New official question on game management

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Had a JV boys game (2 top-notch teams) last year and there was a lot of trash (paper, tin foil from hot dogs) being thrown on the floor. I was trail administering the ball (home team) at the division line opposite the table. Everytime I started to hand the ball to the player, visiting team fans would throw something on the floor. When it happened a couple of times, the AD came over and spotted the fools doing this and they were quickly shown the door. He did this without me asking him to handle it. There is no place in sports for that type of behavior. A lot of fans think because they pay to get in, they can say/do anything. Wrong! Paying only allows them in to see the game. It does not give them the right to throw things or yell profane or derogatory words.