God, if this is happening right now, then my theory that time and constant mention that this is bad behavior will eventually take hold - is not working.
It is sad.
You know I just had a flash back to my sports days in the 60s and 70s and even though the players could get uppity (this was Brooklyn after all) the parents and fans along the sidelines usually held their tongues. Not to say they were perfect, but there was less of it.
Sorry, but WTF is happening? Scratch that I know what's happening. Sports today are violent - full stop. Hockey is off the charts with cheap shots. The NFL is concussion central. Baseball is clearing benches every other day. Basketball is cold-cocking players or climbing in the seats. This is why kids and their child-like parents are doing what they do. Let's stop millionaire athletes from behaving like children and then our children will start behaving like adults. Easy peasy.