The Muslims shouted at him, they were abusive, but the Prophet in his great mercy and wisdom, knew that this is not the way to teach. These are wise words. We need to think about what we think and say so that we can actually help each other, not tear each other down. There is none amongst us who can claim to be perfect. We must not try to usurp the role of Allah by passing judgement on one another.
Pride is dangerous .
Look to the caution of rassol Allah. We have to avoid feeling proud, even of our Islam. Pride and arrogance are the tools of Shaytan. When he was told to prostrate to Adam, and he refused, it became his undoing. He was of those who reject Faith.