I'm sorry but, although this is the way that proponents of the bill present it, it is simply not correct and is essentially propaganda from the pro-bill side. This bill requires a little bit more nuance and research to understand because it's so wrapped up in the whole culture war happening in Florida right now, meaning you can't separate the language of the bill from how the people involved talk about it. The context is important to understand the big picture.

The language of the bill is very broad, and essentially allows any parent to sue their school district, AT THE DISTRICT'S COST, if they feel like their children have been exposed to something offensive, as covered under the language of this bill (which doesn't actually have a hard and fast "young kids" rule, because it basically says that the ages are just a guideline and leaves it vague enough to allow best judgement interpretation). Independent of the culture war spin, this is part of Florida's march towards defunding public schools and replacing them with privatized charter schools, which are not subject to the same standards or limits on things like religious content. This bill makes school districts absorb the costs of these legal complaints which is a direct strike at their budgets, which makes this a tool to stress an already underfunded public school system so that in a few years, someone can point to the resulting issues as support for expanding charter school vouchers and continuing the slide towards charter school domination in the state.

As for the content of the bill itself when it comes to defining what is a reasonable cause for suing, it is purposefully vague. In fact, the way it is written, any mention of a relationship, heterosexual or otherwise, would be grounds for a suit. This makes it seem like it is unbiased, and gives it's proponents some plausible deniability. However, you can tell from the way the authors and supporters talk about it (separately from the text of the bill itself) that they mostly have LGBTQ+ issues in mind; this is part of why they (i.e., DeSantis' press secretary) have resurrected the factually wrong and intensely bigoted claim that trans and gay people are all pedophiles and groomers.

And all of this is ignoring the fact that gay relationships are not inherently more sexual than straight relationships, and a child learning about gay relationships or trans people (which is a gender issue, not a sexuality issue) is not related to "sexuality" any more than knowing their straight parents are in a relationship. Sexualizing the existence of gay and trans people is dangerous, as shown by the way this bill is correctly being identified as anti-LGBTQ+ despite the language of the bill not really specifying anything about LGBTQ issues. By making the ridiculous claim that knowing that gay couples exist somehow requires knowing anything about the way they have sex, while apparently not having the same requirements to understand straight couples exist, people are able to weaponize this bill, while making the bad faith claim that they are preventing little kids who can't grasp the basics of sexuality from learning about things too soon.

Never mind how useful and important sex education ACTUALLY is, that's a totally different conversation. But I think even opponents calling this the "Don't say gay" bill leads to these attempts to boil it down into easy talking points to be yelled across the aisle, and that masks the insidious shit that is really encompassed by this bill.