No joke!

Ah yes let's teach our 4 year olds about homosexuality, great idea

Here's how I handled it when I took my 4 year-old to pre-school.

He asked, "daddy, what does Alex have 2 mommies?"
Me: "Well, his one mom met the other mom. They fell in love and decided to get married and have kids together."
Him: "Oh, like you and mommy?"
Me: "Yep, exactly like that, sport."

Thus endth the lesson. If you need me to come over and explain it to your kids like that, I can.

It's really easy. They understand it right away.

You have a 4yo ?

Well handled. I simply dont believe that this stuff needs to be put into there shows and books

Why shouldn't their shows and books reflect the world they live in, in all its diversity and beauty? And am I supposed to hide friends and family from them, or lie about them? That seems like shoddy parenting.

No but it shouldn't be shoved down there throats before they make decisions about who they are and what they like without being influenced by outside opinions such as tv shows

If I let them know that Hindus, Muslims and Christians are real and believe in a variety of different things, is that "shoving [religion] down there [sic] throats", or is it just telling them about the world that they live in? I don't see how letting them know that love relationships take different forms is any different.

That's taking them to church when they are younger, when they are 18 years old they can make there own desicions on whether they continue to go to church or not

So, when they're kids, I let them learn about a variety of healthy, loving families (Look, his grandparents live with them! See, she just has a dad, but she is still safe and happy! Do you want to go see your friend -- one of his moms can pick you up!) It's not hard, and it doesn't scar children.

Yes, but why do they need to be taught by the stuff they are watching or reading. This should be taught by the parents when they ask about this stuff.

What if their reading material has ben censored and they don't know to ask questions? Or, what if they notice that their parents AREN'T bringing it up and think it's bad and shameful because their parents don't know how to bring it up?

(BTW, people have done cognitive studies that show that when parents don't mention this sensitive stuff, the kids internalize a message that it is bad to talk and ask. It leads to more prejudice and ignorance.)

But why do they need to learn this so young, it is not a topic for pre-schoolers. Just like you said above when your 4 year old asked and you simply responded with "just like your parents" (oversimplified I know) and didn't continue to push it further into teaching him about it.

Why are we so busy teaching them about heterosexuality?

Because. Its. The. Normal. Thing. In. The. World

I'm actually not seeing how kissing comatose girls is such a normal thing . . . and, at any rate, homosexuality, bisexuality, trans-ness are all also normal, if not quite as common.

Interestingly, the chances of a person being blue-eyed are not that different from their identifying as LGBTQ and/or having had same sex attraction or experiences.* I don't want to go and call all those blue-eyed people "abnormal", just because there are 9 brown-eyed people for every one of them.

What matters to me (and I am a parent, and I have thought this through with great care) is that children see examples of loving, healthy relationships as models, and where the relationships are hurtful or unfair, that gets called out. (And, yes, my children have blue eyes, but they're still normal children.)

*https://williamsinstitute.law.ucla.edu/publications/how-many-people-lgbt/
https://www.healthline.com/health/eye-health/eye-color-percentages