Why Is the Pride of Peter a Problem?

Peter allowed the fear of man because when our position becomes more important to us than our service of Jesus it creates a fear of man. The proud person is truly a weak person. What about the legalism of Saul? I think these are interconnected. But just know that pride was a problem for Peter not just here in Acts as well and we're told in Galatians when he once again allowed theFear of Man.