True Story

Had you kept them private, there may not have been a problem. Publucally posting them? Without context, may have been a problem.

You could hire a lawyer, have your folks speak out at a school board meeting, but odds are, the decision won't be overturned and you could open yourself and parents to a libel/slander lawsuit.

I Actually Didn't Post Them. I Was Going To Make A 'Meme Yearbook' Of All My Teachers At The End Of The School Year.

If they weren't posted, then shouldn't be a problem. Ti.e to bring your folks into the fray.