On a more serious note, impostor syndrome can be a manifestation of social anxiety -- "What if they're only pretending they like me?" If you get that feeling in other areas of your life and not just your career, it may be helpful to consult your doctor.
For further actions, you may consider blocking this person and/or reporting abuse
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I mean, sure, I have impostor syndrome, but so did the guy whose identity I stole to get this job.
On a more serious note, impostor syndrome can be a manifestation of social anxiety -- "What if they're only pretending they like me?" If you get that feeling in other areas of your life and not just your career, it may be helpful to consult your doctor.