Matthew 11:20 Then He began to rebuke the cities in which most of His mighty works had been done, because they did not repent.
Jesus rebukes for lack of repentance. Its one thing to not know the LORD or see His works at hand however when He reveals himself and works in a way that is undeniable, one will be responsible for that knowledge. To much is given, much is required. Repentance is a turning away from your sin and turning toward God. His grace is sufficient for us in our ignorance for sure but His grace isnt cheap. It must be received in which drives us to repentance. The LORD corrects those in whom He loves.