Here is an article in the NYT today with 21 examples of the content in question. I think the comments are also interesting. Certainly not straight up liberal progressive opinions, but a diversity of thinking in terms of the place that "softer" values like self-esteem and self-awareness have in math education. Frankly, I could have used a lot more self-esteem when I was struggling with algebra.

https://www.nytimes.com/2022/04/22/u...textbooks.html