I don't actually know how my child will learn to recognize charlatans and snake oil peddlers unless he learns many contradicting theories, has to sort through that, and gain experience doing exactly this.

The one place where we tend to confuse ourselves is that we're charlatans and snake oil peddlers too. We all hold countless unscientific cult beliefs, some individually, and some by virtue of being embedded in a given historical and cultural context. Those are embedded in EVERY cultural and historical context. Anything you teach your kid might be snake oil, and I have enough of an open mind to know I might be wrong.

Ergo, I don't have a problem with teaching kids things which are wrong, so much as with the cult-like way in which schools teach many concepts like CRT, or the right-wing equivalents.