A very close friend narcissistically uploaded her picture to the space and jokingly said, "Don't come out to scare people"-_-she replied to me, "You are not.

Can't answer: that's why we can be friends. It's like targeting the quasi-maiman. You're already angry that she can reply like this. If she is such a good friend who can joke, it must be the wrong time for you to reply, and she may be in a bad mood. You should add an expression after that joke so that she won't get angry. Now is the best reply, don't scare me. Add a naughty expression and it will be ok.