We're talking about schools.
"Liberals" ban "problematic" books in schools all the time.
Florida is simply putting the power in the hands of parents.
Gay sexual oritentation can be discussed in the classroom, but the parents get to decide when it's age appropriate to do so and if the teachers go up against the parents, then they will be breaking the law.
I admit it could have been better thought out, but the left wasn't complaining about the rights of parents when liberal teachers were trying to peddle highly sexual content to young children.
IMHO the fairest and most sensible policy would be that parents of a school decide which year sex education starts and it's all or nothing with sex education covering ALL issues including gender and sexual orientation.
I'm not a parent, but if I were, I would want the school to teach my kids (that I haven't had yet!) sex education from about the age of 11.