My son confessed that he feels scared all the time in the class so we're looking for a new dojo, hopefully with specific beginners classes. Thanks everyone.
Lots of warning bells going off in my head now.
It maybe only your son who is scared but I honestly doubt that. It might be worth finding out if other kids feel the same and do their parents know. How far you take the matter is of course then up to you as a group.
However in my opinion (and based only on your comments) there is a possibility of at least bullying going on here.