In the Middle East, there's no such thing as soft, quiet speech. Everybody shouts at everybody , everywhere, at any time. It starts early in life. Children hear their parents shouting at them and at each other- and they absorb and process this kind of behavior. They then take it out in school and public places.
During vacations, and especially during the long summer vacation, Malls offer various entertainment programs for children. The other day, I happened to be at the Mall and I watched some of it. The most popular are those with prizes, such as machine Games and Trivia contests. In the Games section, there's a terrible noisy music background, so if the child/teenager wants to talk to his friend he must shout at him and ,of course, the latter shouts back at him.
Then there's this spot in the Mall arranged in the form of a mini amphitheater with a large cupole ceiling above, some artificial little waterfalls , and a stage set up for the presenter running the event and the sound system. It's nice inviting individual children on stage, ask them trivia questions and give prizes (posters, toys, etc...) to the winners. The problem is that the presenter in order to diversify the program, chooses also to turn to the whole audience of children (of various ages), asking them to answer his questions. They all yell the answers at him. "I don't hear anything" , he says, " louder, louder" he encourages them. That call for 'louder' is hardly educational or entertaining.
The 'Yell and Shout' thing abuses vocal cords, hurts listeners' ears, damages hearing. Ask any audio therapist and voice therapist; they've got lots of work.
Parents can and should learn to control their anger/frustrations and refrain from yelling at each other and at their children. In public places they don't have much control on what's being offered as entertainment, and yet even there, damage could be minimized with a little effort.