Do you think mental disorders like narcissism, sociopathy and so forth are experienced distinctly internally? That they have unique corresponding internal states? Or does the behaviour just sort of happen with no phenomenological texture?
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That still doesn't make sense. If there's a texture to being a narcissist, no experience or event can, even in principle, reveal that other people don't have that texture if you do and all you can experience is, of course, your own subjective state.
I guess it depends on whether you're a pure Sartrean style phenomenologist, an epiphenomenalist, or whatever else, since it depends on how you think these things influence or don't influence other things.