Good your kids go to a private school and they can sit where they want.
Since your kids aren't going to a public school mind your own business with respect to how they're run and stick to telling the private school how they should do things.
If they aren't good enough for your kids then they obviously aren't worth your busybody time.
You have as much credibility as someone who homeschools does with respect to telling them how they should run their school. In other words, none.
Since I doubt YOUR kids go to this school, what entitles you to have an opinion?
I'll comment as I please, thankyouverymuch.