Sounds completely normal to me. Remember, this happened in a concentrated Democrat parasite nest ("city") where the government schools are little more than pre-prison, institutional acclimation facilities that double as daytime warehouses to keep kids off the streets and out of retail stores.
I agree it may be normal in some school districts. It's still a disgrace. From the information I've seen thus far, I put a lot of the responsibility for this on incompetent admin who may have created a completely unmanageable and unsafe situation. I don't absolve the teacher, but admin has a job to do and I suspect they failed.