What I would suggest is not posting a vanity about on the internet - but actually doing something about it.
Call the school, talk with the teacher, the principal, etc.
Ask questions, require answers, if you aren’t satisfied with the answers, keep asking harder questions.
If this doesn’t work - remove them from this school.
And for all the “homeschool them” proponents. This is not always an option for people, so how about you stop stuffing it down our throats, K?
Oh bull pucky. It's always an option. It's just a matter of whether you want to or not.