If you say so. To me, it sounds more like folks are upset that she told kids that Santa was a myth.
The problem was that she is a lousy teacher. Leaving subtle hints that the story may not be true is one thing. However, several children went home crying because she convinced them that Santa Clause was dead. She was clearly operating above her pay grade.
That's exactly right. She trumped the parents and dispelled something that they had decided to allow or perpetuate.
Doesn't matter what I tell my kid. If I want to tell him that dogs can secretly talk to each other, I have that right.
If he asks her and she says "no they can't", I still have no problem with it-- even though my fun would be done.
If she knows, however, that I'm perpetuating that particular myth, and decides to take it on herself to effectively convince my kid that I'm a liar-- not to mention destroy our collective fun-- I'll sure as hell have a problem with her.