red Darth Vader lunchbox!
shouldn’t Darth Vader lunchboxes be black?
Hmm, an interesting conjecture. I reckon the red was probably implemented as a nod towards the empire’s choice of light sabre colours.
OP – It sounds to me like the head has taken a dislike to your family. If I saw someone do that to one of my kids I would take follow up action with the local authority, as others have suggested.
Problem is – if your kids are happy in the school, are you prepared to move them? Your relationship with this head teacher sounds strained now. Would she be professional enough to treat your children impartially after you start a complaint about her? On the info you have given so far I doubt it.
best of luck – hope you get to resolve this distressing situation with minimal impact to kids and school