The lunch box police

are at it again. 
A small boy I am acquainted with came home from school in tears because he had - wait for it - a chocolate biscuit in his lunch box. He also had cheese, carrot, and celery sticks, several cherry tomatoes and some home-made seed and nut biscuits (crackers to my US readers). There was a banana too - but that didn't fit in the lunch box.
His teacher told him - in front of his class mates - that he could not have the chocolate biscuit. It was "unhealthy food". She took it from him and told him he could have it back after school.
His mother, who is very careful about what children eat, is furious. The biscuit was a reward for having spent a considerable time genuinely helping an elderly neighbour clear up some leaves and other detritus.
T's school has gone overboard on what can be consumed at school. The school canteen only sells "healthy options". The result has been that the canteen is now used less than it was. Older children are apparently becoming adept at hiding their "less healthy options" from their teachers but T.... is too young for that - and he shouldn't have to do it any way.
I know we have an obesity problem but taking a chocolate biscuit from a child is going too far, much too far. T... has not liked school much so far and now he doesn't want to go at all. When I saw his mother she was about to go and speak to the teacher. She had given herself the weekend to "cool down" but I could see she was still fuming. 
    "Let me know how you get on," I told her knowing that she would need someone to talk to.
She called me later and was, if anything, even angrier.
    "She told me that the children had agreed they wouldn't have anything unhealthy in their lunch boxes. She said T.... broke the rules and she had no choice but to take it away and let the other children know. That's absolute rubbish. I don't mind them knowing about healthy options but five year old children can't control what is put in their lunch boxes!"
I agree.  
I asked her how he had been at school that day. He had not wanted to go and the teacher aide in the classroom (there's a severely intellectually disabled child in the class) told his mother that he had been very quiet and that he had been subjected to some remarks about food at lunch time. The remarks weren't unkind but they still upset him.
She left me an email a little while ago. T.... doesn't want to go to school at all today. He's apparently crying that his teacher doesn't like him. He doesn't want to take any lunch to school. 
All this over one small chocolate biscuit. 
T.... is a nice child, a particularly nice child. He likes to help other people. He is well on the way to being able to read. His parents have strictly limited his screen time and he plays some wonderful creative games. He is the only child and, although they would have liked another, there won't be any more. Until now he hasn't been a problem at all. 
His father will be back from an interstate conference today and I hope they can sort the problem out.
But, there shouldn't be a problem. Even if T....had gone to school with nothing more than a jam sandwich - something the teacher would no doubt consider "unhealthy" - he should not have been humiliated in front of his class mates.
I wonder if the teacher will ever realise how much harm she has done?