In reply to subtle:
What The Wild Scallion said. Before that, I might be tempted to when he has some soup in front of him, put him on the spot and ask him how he'd feel if the rest of the group spat in his soup before he ate it. I might be tempted to get people to hush before asking him that. We apparently don't process negative engrams in our minds, meaning that when we think to ourselves 'Don't panic' the only word which sticks is 'panic', he needs to be led (nudged) towards having some more empathy.
Edit: In my Forest Schools course the ethos might have been against him being on the spot in front of other children, but I'd definitely ask him how he'd feel, towards possibly stopping him turning into so much of a shit when he's an adult.
Post edited at 13:34