Had a recent example of this.......one of my son's teachers at the local high school. I finally heard enough about this guy's drivel; wrote him an email.
I stated clearly and firmly that I didn't send my son, or any of my children, to that school to be subjected to pathetic attempts at leftist indoctrination. I challenged him to openly debate me in front of his class on literally any topic he chose............any. Do that.....or forever hold his trap shut in front of these kids on such things.
He wrote the most fawning, spineless, belly-up little note of apology and contrition back to me that you could possibly imagine. Totally backed down.
They're wimps, folks, and you've got to call 'em at this stuff or they won't stop.