Okay, alright, I don't know who needs to hear this, but I have to say this, and this is coming from an aro ace genderqueer person.
Telling kids gay people exist is VERY DIFFERENT than teaching kids s*xual content. If teaching bunch of kids young as 7-8 years old (like they did in my school, yes I live in the USA) highly explicit disturbing heterosexual content (that's probably why the lady told us to never talk about what happens in that class to anyone not even our parents ever) then telling those same kids about homosexuality shouldn't be any different in the slightest.
"Kids can't have a sexuality or a romantic orientation", I'll admit I do 100% agree with that statement.
Straight and Gay or romantic concepts in general are not understood the same way to a child as to an adult, a gay/lesbian adult when they were a child could have had "crushes" on someone of the opposite gender because they didn't understand what romantic love actually is, also it could be the result of heteronormative ideals making them mistake it for a crush, not until they are older and understand what it actually means to have romantic attraction to someone may the gay/lesbian person realize they were actually gay/lesbian.
The same can go the other way as well, a straight person when they were a child could have had "crushes" on the same gender because they didn't understand the concept of romantic attraction, and only realized it until they are older.
Aro and/or Ace adults during childhood could have had "crushes" on other kids not until they learn what romantic love actually is or what crushes actually are would they be able to understand that they are Aro/Ace.
HOWEVER, a gay/lesbian adult could have had same gender crushes during childhood, though this doesn't necessarily mean that they are gay/lesbian in the same way as an them as an adult or any gay/lesbian adult would be, but neither does it make their identity any less valid.
Heterosexuality and Homosexuality shouldn't be forced on children, but telling kids that not all women love men or not all men love women is perfectly fine. Telling kids that not all people are male or female, whether that's because they are Intersex (biological) or Non-Binary (Gender), helps kids learn about people who are different from them and perhaps even themselves.
I do believe Trans kids exist but ARE NOT the same as a transgender adults, Trans kids should be supported, love and accepted by their parents just like any other child should, I do agree they SHOULDN'T be allowed to have permanent/surgical transitions, but ABSOLUTELY should be allowed to explore interests, cross-dress, take hormone blockers, socially transition but NOTHING that is NOT reversable.
As children do not have the same understanding of these concepts as much as a mature adult would, they could grow up to be transgender as much as they can just grow up to be just a Tomboy/Janegirl and not transgender, they could also grow up to be non-binary. (whether or not you consider non-binary to count as transgender or something else, is up for debate and I hold no side in the matter as believe it's up to whether the non-binary individual conciders themselves as transgender) , but it should NEVER make it valid or right to EVER harm and punish your child for being different or push your child into being someone they are not, you should support and love your trans child no matter if they continue to identify as transgender or not regardless of age.
Gender has nothing to do with biology because it's something society has created, like money, politics and religion, (not war and sl*very because ants also practice warfare and sl*very believe it or not.).
a [woman/man] (sex) can be defined as "an adult [female(XX) / male(XY) human]", clearly referring to 2 out of multiple chromosome combinations in humans.
a [woman/man] (gender) can be defined as "a person who identifies and associated themselves with the traits that are socially seen and personality behaviors that society typically associated with a [female/male]". Clearly referring to a social construct created by humanity and not dependent on chromosomal combinations (XX, XY, X, XXY, XXYY, XYY, ect.)
I am NOT SAYING Biological sex is binary at ALL, biological sex is FAR from being binary, any biologist can tell you that, I am saying that telling kids gay/lesbian and transgender people exist is no different than telling kids that straight cisgender people exist.
Telling kids that not everyone is the same religion, not everyone thinks the same, not everyone is neurotypical, not everyone acts the same, not everyone is abled bodied, not everyone has the same culture, not everyone is the same race as you, not everyone is the same, is vital to raising children to love and respect other people as the grow up.
telling children that some girls like girls, some boys like boys, some girls/boys don't like boys nor girls or some boys/girls like both boys/girls, and some people aren't boys nor girls, is no different.
You don't have to agree with anyone to respect and love anyone.
Support and love your children and your fellow neighbor.