When Sherlock is talking about how everyone is human and he says “even YOU” to John, it’s totally flip flopping how John thinks it is. John thinks he’s the one who imagines Sherlock as this untouchable infallible being and he gets more and more angry the more that isn’t true because it means Sherlock might actually FEEL things like everyone else and that’s delving way too deep into John’s repressed love for him, you know?
But Sherlock saying “even YOU” undeniably tells John that Sherlock feels the same way, and that Sherlock thinks JOHN is this untouchable amazing human, that he puts John on this pedestal and adores him above all else and is only just realizing John is a human who hurts and feels things and is vulnerable and John needs to hear that SO BAD, he needs to know what he means to Sherlock, and really hear it from Sherlock himself because John’s gone through a lot and he needs reassurance that Sherlock does feel things and Sherlock IS human. That conversation is so much. They both are realizing exactly how real the other is, and exactly how much the other feels. That’s SUCH a big step.