So he is then upset by them being mean to him and doesn't want to go to school?
This is at least the 3rd occasion a kid like this has been moved next to him.
Last year the teacher admitted that she had done it so DS's good influence rubs off but why should he suffer for it?
He's the youngest in the class as well (Yr2)and some of these DC are almost a whole year older.
Isn't this just very lazy teaching?