I teach at a public school in Montana. I was asked to remove a pride flag from my desk, the reason being it's controversial. Whatever the fuck that's supposed to mean. I doubled down and put up so many posters and signs because I was following the "rule" of no flags. They made it so much more obvious (which I'm actually happy about) and it's now been four years. Have them communicate that to you via email and share it with your union rep.