I think that concern is like a gentle paranoia & happens to me a lot when I'm up. Not when I'm in full-blown mania, as I'm very psychotic & incoherent & inconsiderate at that point, but when I'm just riding the wave. But it could be related to schizophrenia, I suppose. Thinking people are something when they're not. Not a fully formed delusion, but in the same ballpark.