You shouldn't have to teach him resilience It is so hard to know what the right thing to do is but it seems like changing days is your only real option at this point if the staff can't do anything to stop it happening. Maybe when you get there and these kids are waiting at the gate for him, maybe you could say something to them to let them know you have their number kwim? Often kids who do stuff like this do it because they think they have the teachers bluffed and that the teachers don't know what is going on, and that is what is so insidious about it all, but if you pull them up for it they might be reluctant to do it because they think they will get in trouble. If you said "DS told me what you did to him the other day, and it really wasn't a nice thing to do was it?" and be nice when you say it, it might make them think twice about doing it again. But I do hope you work it out whatever way you choose to handle it, the poor kid shouldn't have to be dealing with that