New York father Andrew Gutmann believed he was sending his daughter to one of the best schools in the country. It’s called Brearley, and it’s a private all-girls school on the Upper East Side of Manhattan that costs $54,000 per year, which is more than most colleges charge for tuition. But he believed it would be worth it — until he realized what the school was teaching.

In a letter Gutmann sent to all 600 or so families in the school last week, he warned the other parents that what their children were learning at Brearley was toxic, wrong, and deeply damaging. So after seven years, he decided to pull his daughter from the school, and he encouraged other parents to do the same.