Hi,
Oh I feel for you and your son. But it is very good that he was able to articulate his feelings.
Yes, it typically takes a bit of time for us before child speaks up. Sometimes it is in the evening at bed time or it isn't until the weekend where we've had some quieter decompressing time.
Have you considered looking beyond your school for other kids? Is there a gifted support group near you that you could meet other families of gifted kids? That might help a little bit, or at least make it more tolerable. It does feel better to know there are other kids out there.