I've seen kids do this a lot prior to my T, I didn't think anything of it. I just thought that maybe they were overwhelmed by all the different sounds and it was something that they just had to get used to. I had no idea that a sporting event was really all that loud prior to my T, I'm sure that they don't either. I'm pretty sure that that kids screaming friends at playtime are just as loud or pretty close to that NBA game. Kids scream at extremely high volumes right into each other's ears, do you put ear muffs on them everyday while they play with their friends?
Before T, if someone told me that going to a sporting event was loud enough to cause hearing damage I would have been extremely surprised. I'm still surprised really! Any sports event that I have ever been to, I have never seen anyone wearing ear plugs in the audience (including babies), and definately not a single player. Looking at your surroundings, why would you think that anyone is in danger when the entire world is not wearing protection? It's not something that even crossed my mind and will not cross the minds of many.
You would think that if this was so dangerous that all these players would have hearing issues, yet doing a online search, i can't find one player in any sport throughout history that has had their hearing damaged in this way and they subject themselves for their entire careers. And some of these players start playing at large venues at the age of 13-14 years old. Where are all these players with hearing loss? And what about the players that move on even in retirement years and call the games for another 20? If this is all so dangerous then why are all these people not deaf by now?