Parents in Brooklyn, New York, should be outraged by the latest effort to indoctrinate their children with far-Left ideology.

In New York City, which currently recognizes 31 genders, it’s not all that surprising that schools are now inviting drag queens into the classroom to teach kids about gender fluidity.

Still, it’s shameful — and ultimately harmful to children.

Forget about core subjects such as math, reading, and writing, as progressives vie for young souls in the arena of ideology.

In a video clip recently released by videographer Sean Fitzgerald in conjunction with and the David Horowitz Freedom Center, teachers are praising the new “Drag Queen Story Hour.”

(See the video at the bottom of this piece.)

Maurice Sendak Community School, a New York public school in Park Slope, Brooklyn, hosted the book-reading drag queen, and first-grade teacher Alexis Hernandez seemed enamored with the whole idea in a testimonial published on Drag Queen Story Hour’s website, according to reporting from The Daily Caller.

“Drag Queen Story Hour gave my first-graders a fun and interactive platform to talk and think about social and emotional issues like acceptance, being yourself, and loving who you are,” Hernandez gushed.

“During our debrief … [students] were preaching the incredible lessons they had learned, like ‘It’s OK to be different,’ and ‘There’s no such thing’ as ‘boy’ and ‘girl’ things,” she added.

First-grade teacher Katrina Green said she would be hosting the event again the next year at Chickpeas Preschool, also in Brooklyn. She also lauded the program in her testimonial.

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The event “allows preschool children to deepen and complicate their ideas about gender at the exact age when they are often developing rigid ideas about this concept,” Green said.

Distressingly, Drag Queen Story Hour markets itself for children who are just three to eight years old. The program’s reading list includes books like “Jacob’s New Dress” by Sarah and Ian Hoffman, and “Red: A Crayon’s Story” by Michael Hall.

This is indoctrination, clear and simple, perpetrated on small and innocent members of our “enlightened” society.

It is a goal of progressives to sow confusion in young children, and to convince them there are no differences between girls and boys — and that gender is merely an oppressive social construct.

The problem? That isn’t the truth.

“It is common knowledge among genetics experts that complex behaviors, including how we think and feel, are not hard-wired before birth,” Dr. Michelle Cretella, executive director of the American College of Pediatricians in Gainesville, Florida, recently told LifeZette on the topic. “Transgender beliefs and feelings are no exception. Our cognitive ability to recognize our biological sex develops over time.”

Related: Parents Are Calling Babies ‘Theybies’ to Remove ‘Gender Stereotypes’ — Ludicrous

“Think about how absurd this is,” Fitzgerald, the videographer, says in the video. “The taxpayer is funding adult-themed performers to come and read to our smallish children in order to indoctrinate them into a political ideology about gender while, at the same time, school districts across the country are removing any and all references to biological sex from science textbooks.”

Parents beware. And be outraged.

Elizabeth Economou is a former CNBC staff writer and adjunct professor. Follow her on Twitter.