That's nothing.
Per the Babylon Bee:
"State Of California Rejects 100% Of Biology Textbooks For Stating There Are Only Two Genders"
More seriously, my guess (so I would like to see actual examples) is that math is being implied to be, or made to be, subjective.
After all--your tax dollars at work--the National Museum of African American history says the scientific method is 'White Culture':
The museum will teach you other things about 'whiteness' also:
Combining the two. Whites are racist and will force you to do things like work hard and be on time, and if you are doing math, you might even be forced to employ 'Objective, rational linear theory' or have a 'Quantitative emphasis'.
So I do wonder what a math textbook written by those doing exhibits at one of our government museums would be like.