In high school sports, Kids yelling airball is part of the game and is acceptable because at that level kids should be able to shoot the 3 point shot or defend a fast break. At the Jr High level, they are still learning. There are tons of airballs and tons of traveling calls. Lets remember the level they are at because it's not Varsity.
I don't think any of Mandan's school coaches would approve. I think it's parents living their life thru their kid's sports. Just because you know how to press and beat a 7th grade team by 30 does not mean when you are on the Varsity level, you would be able to do the same thing to that same team.