Even if there is a child in the room who identifies as a cat, it would be reasonable for these girls to challenge a teacher who was telling them they must accept that the child is a cat. The teacher trying to force them to accept something entirely false is 100% at fault in that situation.
Pointing out the truth when being coerced into accepting falsehoods is not bullying.
And the poster who can’t understand that there is a difference between accepting that your child wants to play at being a dinosaur and accepting that your child actually is a dinosaur is just expressing something so bizarre I can’t get my head around it.
A return to reality is needed. Children can imagine whatever they like, but when teachers can no longer point out the difference between imagination, confusion and reality, then there is a huge problem.
If a child really believes they are a cat, then they are not mentally healthy enough to be in a classroom. If telling them they are not a cat causes so much distress that the teacher doesn’t feel able to tell them, then the child is not mentally healthy enough to be in the classroom.
Affirming to children they are something they are not is so irrational that I would question whether any teacher who does it is of sound mind. None of that should be in any way controversial.