OP I don't think your family have been insulted, but I do get how you feel a bit.
My DS who has aspergers wasn't diagnosed until year 4. In year 1 he had 3 friend, and it was no mean feat for him to have friend, trust me. One left the school as he moved out the area. One died (cancer) and at the end of year one his last friend was put in a different class. After that, he didn't get close to anyone. And when he was diagnosed, the psych at CAMHS said she wasn't suprised, because on top of aspergers, whoever he got close to left or died.
Now I'm not saying this is how every child reacts. But I'm neurotypical, and I remember being in primary and had a friend from Australia - she moved back to Australia. I had a friend from Indonesia, she went back there. I had 2 friends from Japan, they both eventually moved. My 2 sisters used to joke that everyone that was my friend was so desperate to get away from me they moved to the other side of the earth
. But I knew beforehand that they were going so said my goodbyes, and one of my japanese friends and I were still writing to each other up until about 10 years ago (I'm 46 now). If one afternoon at hometime the class teacher announced that one of them wasn't coming back I'd have been quite gutted.
Yes it's true I got over my friends going because as a PP said, kids are resilient. But I think it would be nice if, a few days before said child was leaving the class knew, so they could make a card, or decide if they want to be penpals (or email/text buddies as the times have changed)
I think you've had a hard time here, but I think that's because you've used the word insulted. I don't think you're family has been insulted, but I also think it's a good thing to say goodbye as well.
notevenwithconsent I understand your point, and I think in your situation it was the best thing safety wise. I wouldn't have it as a general rule though - more that there are some circumstances where it's right that children aren't told someone is leaving.