How to End a Kid Friendship?

I posted a few weeks ago about a boy in my sons first grade class whose friendship I wasn’t crazy about. The boy was playing games with my son at recess that I didn’t like (signing notes with other people’s names at the bottom, trying to trap other kids, etc). My son has since made good decisions and has distanced himself.Here’s the problem: the boy is now accosting my son, announcing loudly that he’s not invited to his birthday party, telling other kids to go up to my son and tell him he’s mean, etc.I don’t know what to do as much of this happens at recess when the teacher isn’t around (just lunch aides who’ve missed some of it as the boy is smart about when he says this).I’ve thought about reaching out to the mother, but at the end of the day I’m not sure what that’ll accomplish. She is a very odd, needy woman and I’ve found her sons issues stem from her. While I don’t want the kids to be best friends, I do want them to be able to coexist in the same building.What would you do? via /r/Parenting https://ift.tt/38I2LOk