One quick point to highlight. I too agree with correcting inappropriate behavior and would advocate more of it in today’s society. However, I can’t think of any justification for physically or verbally abusing a child based on their performance in a match. Just because you think they should have won is no reason to belittle or worse, physically punish the kid because they didn’t meet your expectation. Unfortunately I have witnessed this several times over the years and in my opinion this is child abuse and has no place in any sport.