The Department of Education OCR (Office of Civil Rights) now unilaterally rolls out the rules governing everybody in school. It's happened so fast that most people don't even see it happening. All based on the following phrase:
"No person in the United States shall, on the basis of sex, be excluded from participation in, be denied the benefits of, or be subjected to discrimination under any education program or activity receiving federal financial assistance."
(from the Patsy Takemoto Mink Equal Opportunity in Education Act)
Who voting for this knew that it completely altered the meaning of "Men's" and "Women's" restrooms, to line up with the rapidly shifting meaning of "Male" and "Female".