I'd get the whole story from someone else that was there. My kids have been taking Tang Soo Do for several years and I've seen the instructor sweep a kid or tap them on the head with a kick pad if they weren't paying attention. Part of the training is to always be aware of those around you. It's never in a violent hurtful way, but just to grab their attention. I can see how a child that age might be embarrassed or have hurt feelings about it. I'd also make a point to stay and watch class with that instructor.
Stacey ~ mama to 3 sweet girls and 1 little prince