I know, this sounds really bad but theres context needed. 

Im in a band class with a disabled kid. He constantly shakes his hand and disrupts the class with loud yelling/growling (i don’t really know how to describe it). He also doesn’t listen even though he can. I don’t say anything to him as I know somethings he just cant control, but I know he can control his growling (?). During competitions he has put us in risk of being disqualified for playing when we aren’t supposed to. I do not want to come off as rude or disrespectful in anyway but I want the band to be able to focus and play without any distractions and it’s difficult. A lot of people dislike him for this reason and I try to keep it down but its though, I want to talk to him and ask him if he can keep it down but, WIBTA if I did that? I don’t want to be rude in anyway as I do not know what he is going through and I don’t want assume. 