You are obviously and logically correct. The obviousness is exactly the point of the law because it creates vagueness. It’s just another right wing attack on public schools.
There’s actually lots of good reasons, including proper hygiene, helping children understand consent, privacy, boundaries. But you’ve made a choice in how to frame the conversation that is designed to eliminate any need to learn…I can’t help you there but demands of ignorance shouldn’t be how we legislate.