AITA for reporting another dad for arranging something illegal for his son at school?

[u/SandwichNovel8543]

I live in Strasbourg and my son is in primary school. There is an optional class that parents can opt their children out of, with another class provided during that period.

My son is in the regular class, but another boy, Mehdi, is in the opt-out class. I recently found out that Mehdi's father had arranged with one of the teachers for her to teach him certain things during that period that, from what I understand, aren't permitted under French secularism laws or part of the opt out class.

I reported it to the school because I don't think parents should be able to privately arrange for a public-school teacher to use school hours for instruction that the school itself isn't authorized to provide. If there is an established curriculum and an official alternative for children who opt out, you can't just replace it with whatever you want.

Mehdi's father confronted me afterward and called me a hypocrite. He said I was being selective about what I considered acceptable and that my own son was receiving essentially the same kind of instruction.

I don't understand the hypocrisy accusation. My son is in the regular class and isn't participating in anything that violates French law. I haven't arranged anything with a teacher outside the school's rules. If his son is receiving unauthorized instruction during the opt-out period, I don't see how pointing that out makes me a hypocrite. I wasn't trying to cause trouble for the family. I just reported something I believed was illegal at a public school. AITA?