You might be being facetious and trying to imply that the political views taught in school are actually moderate, but I'm going to take the question literally anyway.

One example is the idea that a bio man should and must be called a woman if they declare themselves to be so. Regardless of whether or not you agree, it is an extreme viewpoint that has only just now become acceptable to believe in terms of history.

> Maybe I'm living under a rock; what extreme views are going through the school system?

Not op and not taking a stance on any of these here, but:

1. Critical race theory (CRT)

2. Gender fluidity

3. Endorsement and use of Christianity/Bible in public schools

These are all hot-button issues in education today, at least in some states and districts.