The context of the following conversation is Kai knew that things were getting out of control and managed to keep his temper in check.:
Kai says I really had to hold back my temper with Tom and Jeff the other day..
The friend responds What did they do now?.
Kai responds Well, they started picking on the kids at the other table at lunch the other day..
The friend responds They really have to stop being bullies..
Kai responds Honestly, I don't know why I sit with them. This time, things were really getting out of control. One of the kids looked like he was going to cry..
The friend responds Oh my God. You really need to set them straight. It's ok to joke around, but not ok to bully..