I have heard that before! Have specifically heard it in these videos, even. The big comparison points are redheads and schizophrenia: "If DID is as common as natural redheads/schizophrenics, and nobody questions that those exist, why is there so much doubt about DID?"

I wasn't rude enough to reply with "maybe it's not actually that common" with zero evidence to back that up. But I did think it.