It starts at the top. When you have coaches encouraging the booing of an official to the high school student section while waving his arms in the air and walking along the side of the mat, then the outbursts of emotion from kids should expected. The meet had been hyped up for weeks and I am sure the wrestlers wanted to put on a display for the crowd. This being said, a celebration is fine when done in the right fashion and with class and respect for both yourself, your team/ school, your family, and most importantly your opponent.