Agree at a general level about bold American culture (as opposed to more reserved), and it's not always my thing either (!). I am not a loud person myself, and I don't follow or cheer pro sports like baseball or American football.
BUT look at other sports like pro soccer ("football") games all over the world. Passion. Excitement. Loud. Bold. Drama. Yes, it's a team, but individuals are playing the crowd. The English and Italians get just as crazy as the Senegalese, Egyptians, and Thais. Culture isn't so different in this arena. And at the Olympics, the Brazilian crowd in Rio was loud and proud for their athletes, including gymnasts (many south american countries have a similar bold and passionate culture, I'd say). It was exciting. The thrill of victory, the agony of defeat. Everyone felt it.
So what should be gymnastic's identity? Who does gymnastics for the world want to be? Do we want to be the equivalent of a subdued, elitist afternoon at the Country Club with the Polo Ponies and a round of Golf? Or do we want to produce athletic superstars with passionate fans who cheer, instagram, and fight over who is hotter - Max or Yul? Would a bit more chest-thumping and fist-pumping be so bad?
Open question for our future...