Paul triples down and calls the Corinthians "children" because they were acting like children.

To be saved and then remain selfish is very normal on a short term timeline, but long term we should be growing and maturing in Christ. The Corinth Chrinthian's were selfish and they didn't like Paul because he called them out and called them "children". Paul basically tells them that he is going to treat them like children because they were acting like a immature child and not a Spiritual Christian.
We all probably need to grow up and change our attitudes and our actions and be more Christ like in both. Welcome to Grace Life Unleashed