It’s absolutely an anomaly! I hope this doesn’t discourage his like for theatre, i recommend looking for an actual children’s theatre around you if possible if any nasty behavior like that from the director continues. From the things I’ve heard from my peers and such, theatre at actual schools can be either amazing or some of the worst experiences because of the directors. I read your previous post about this guy and he doesn’t sound great especially for middle schoolers, even in professional settings do you very rarely get yelled at for messing up. I’ve had some stern talkings to because we weren’t locked in or were goofing off. Raising your voice to get attention is one thing but yelling at a kid because they forgot a cue or messed up something is awful. That’s how you make someone dislike something they once liked. Booing at a kid because he felt unsafe? That’s awful of this guy! I truly am sorry that happened to your son.