Or anyone with similar experience :).
Ds yr4 has one best friend (A) , in different classes this year, but still hang out at break/lunch, along with a very good, younger friend of both (B). Another kid (C) sits with B in class and has started following the group around at free time. He has been pushing, shoving, taking hats and calling names for a while, and the others retaliate and have gotten into trouble. Telling the teacher on duty hasn't resolved anything, as she asked C if he wanted to be friends, he said yes, but has continued with poor behaviour. DS is overweight (started due to physical /medical issues) and it is getting him down to be called fatty by this kid every day. I've told him to avoid, report to teacher, etc, but nothing has happened or changed. He should not have to put up with regular verbal abuse nor leave his group of friends just because some mouthy kid wants to hang out with one of his friends. I don't see why the group should include him if he can't be nice, either! Kid hasn't improved over months, he's had plenty of time to make a change.
What's the most tactful and effective thing to do/say? Soumds like a small thing, but its having a big impact on ds. Making other friends isnt an option, as his other friends play footy during free time, which he's not up for or interested in.
Any advice gratefully received on how to proceed!