DS teacher has told the class that she's heard that each and everyone of her class has tried so hard this year that they're all on FC good list, and on her list too, and should be terribly proud of themselves, as trying is all anyone can ever ask of them, and trying hard is the best thing they can do.
Very sweet message, I was surprised that she'd linked it to Father Christmas and The List, but thinking about it, the way it was said promises no presents, and certainly no threats of Christmas cancellations. And for children who know its a story / don't believe for cultural reasons or parental choice, it could be taken as a funny / seasonal way of saying 'well done', and for those who believe it's ok too.
So in retrospect, and compared to this thread, we'll done DS teacher 
Btw, I'd hung draw and quarter the idiot head who appears to have no experience, insight or empathy with children at all! And as for the crassness of punishing one gender, in a way that will alienate and upset children with difficult backgrounds and experiences... Well, the head appears to be missing most of the basic skillet of being a teacher, let alone the ability to run a school.
OP, did you mention to the class teacher what a negative impact this will have on your son due to his specific circumstances? I just feel that shouldn't be lost somehow, though of course you may not want to draw attention to his personal experiences. It makes my blood boil on his and your behalf!