"A lesson meant for first grade called 'Pink, Blue and Purple'... from a curriculum called 'Rights, Respect, Responsibility'... tells students that gender is not a fixed attribute."

"'You might feel like you’re a boy even if you have body parts that some people might tell you are "girl" parts,' the teachers are told to say. 'You might feel like a girl even if you have body parts that some people tell you are "boy" parts. And you might not feel like you’re a boy or a girl, but you’re a little bit of both. No matter how you feel, you’re perfectly normal!'... In his kindergarten classroom, one teacher in western Massachusetts using 'Rights, Respect, Responsibility' introduces the idea of gender as part of an exploration of identity. He explains that people use all sorts of pronouns: he, she, they, ze. He introduces the terms transgender and gender queer but doesn’t fully define them because that is too much for kindergartners, said the teacher, who spoke on the condition of anonymity because his district did not authorize him to speak publicly. He talks to students about anatomy but declines to classify various body parts as male or female. 'We don’t say a penis belongs to a man,' he said. It belongs to a human, he explains."

From "Gender identity lessons, banned in some schools, are rising in others/Students are told that dolls aren’t just for girls, and that there are no 'boy colors' or 'girl colors'" (WaPo).

I don't see why there should be any need to say anything at all about genitalia in kindergarten and first grade. To force the subject, with open discussion about how children think about their genitalia, strikes me as wrong — to the point where I'd say it's objectively wrong. It's at least objectively true that some of the parents will feel that it's wrong to have kindergarten and first grade lessons teaching children about genitalia and how to think about them. 

WaPo nudges its readers to regard objection to these lessons as something conservatives do. We're told that "a conservative activist" calls it "cult grooming and ideological grooming." That is, we're encouraged to see the objection to the lesson — rather than the lesson itself — as strange and extreme.