Recently a kid was thrown out of one of his on-line classes because he has a Trump/Pence flag on his bedrrom wall. If THAT'S not an attempt at indoctrination then I don't know what is. To tell a student, and the rest of the class, that he's doing something WRONG by supporting the country's President and then punishing the kid for it is insane, yet we hear of these occurrances more and more.
I would think a call to the Superintendent's Office for the school district is in order (well maybe start at the school's Principal's Office first). A Teacher is there to TEACH the class material, not to have their political views seen everywhere, especially in a student's home bedroom !