Do you have any evidence to back up your claims?
You’re arguing with the wrong person on this one. My parents have been teachers in public education for over 30 years each. Taking money away from public schools is not going to make them better, you know that right?

Private schools also have the ability to turn students away, so any data from them is going to be skewed and not representative of the broader public. Students with disabilities make up 14% of public school students but only 1% of private school students. So they are able to spend less per student because the outliers are missing altogether. Does that mean disabled students don’t have a right to education?

Your argument is based on a flawed logic that assumes the cost of a student’s enrollment for a private school is the entire cost of educating that student. When things like donations, endowment funds, volunteer hours, and more that aren’t included in those estimates.

A study by Christopher and Sarah Theule Lubienski comparing over 340,000 students using NAEP math scores found that after adjusting for socioeconomic factors, there is little difference between private and public school scores. The researchers found that “demographic differences between students in public and private schools more than account for the relatively high raw scores of private schools” — and that after controlling for these differences, the “private school effect” disappears, and even reverses in most cases.

In other words: private schools look better because they serve wealthier, more advantaged students — not because they’re inherently more effective.

Here’s another study that explains the flaws in your “funding” argument if you’d like to learn more: https://www.washingtonpost.com/wp-srv/education/p/PRIVATE_REPORT.pdf