My friend's DD (5 yo with suspected SEN) who loses her things at school a lot, was told by her class teacher, after they found her lost cardigan, that 'this is what happens when your head is not screwed on properly'. This happened at pick up and my friend was quite upset with the language the teacher used.
DH who is English thinks this is just an English expression and it means nothing offensive. But friend is not English and thinks it's no ok. What do you think?