<p>Courts tend to construe “opinion” very broadly in defamation cases. Saying that a teacher sucks or that she’s “the worst teacher I ever met” is clearly opinion. Saying that a teacher can’t control her classroom also would likely be considered opinion. Even if there are one or two comments that could be considered “facts”, a court would take them in the context of the entire rant, and clearly the whole thing is opinion. </p>
<p>Doesn’t sound like the kid’s page was any more defamatory than the threads on CC that say, “My kid’s teacher gave him a grade he didn’t deserve” or “Isn’t it unfair that the teacher gives every kid in a project a zero if one kid doesn’t do the work?” Those are all opinions, too.</p>