Actually, what has liberals in a tizzy is the massive shift of power away from them to the parents.
Essentially, the law flips the script where almost everything becomes opt-in instead of opt-out. There could also be criminal penalties for not seeking parental permission in advance. Only pedophiles could possibly be against this state of affairs.
To become outraged and attempt to defeat the law on a anti-parental rights basis would be political suicide in an election year, so liberals had to invent a pithy lie to get the useful idiots to carry the water. Hence, "don't say gay" was born.
The problem is the word "gay" appears exactly zero times in the text of the law. It doesn't limit any of those discussions from taking place, it completely bans them from taking place WITHOUT PARENTAL PERMISSION. This is what set liberals off.
What I want to know is simply this : why would you want to have discussions my children are ill-equipped to handle WITHOUT MY PERMISSION? What, exactly, are you trying to hide?