This will require a confrontation.
Get on committees
Run for School board
Find parent peers and allies
Define ALL terms
Demand Evidence to support the pedagogical reasons for proposed curricular changes
Ignoring it will not make it go away
Propose a free expression statement at your child's school
Go to the school counselors - They are important, impartial allies in protecting student mental health and an essential intermediary between faculty and administration (assuming they have been trained properly.)
Remember that students comprise a captive audience or minors forced to attend due to compulsory attendance laws and, as such, deserve protection from adults' misuse of their access to them.
Books: David Moshman, Liberty and Learning.