It sounds like he is testing his boundaries and it seems very normal. If he gets a reaction, he'll just keep doing it. If he was my Grandchild I'd probably laugh it off with, "I'm not always so fond of you when you are trying to be hurtful." I'd get his parents to explain what a joke is and that it is not funny if it is hurtful. He will grow out of it and his sense of humour will become more mature. Maybe you can teach him by example of a more gentle way of teasing.
what is this behavior called does it have a name?
So it begins….. Streeting resigns
Angela Rayner cleared by HMRC. What a coincidence!
Is it rude to not finish a book club choice that was selected by someone else?

