You're not really real

I don't actually exist. I'm a silly idea in everyones head. Mostly stereotyped, complexly and subtly varied. But always and predictably shallow. Way off the mark of reality. If they spend more time with me, it begins to annoy them that they got it wrong and they start to become rather aggressive. It happens quite suddenly. One minute we're having a perfectly amiable conversation, the next they're pissed off I said something I shouldn't have according to the imaginary me that exists only in their shallow head.