When the gospel is preached and people rejoice, we can say with the Apostle Paul that we are looking at the chosen of God!
Those dead in sin know the truth but they suppress it and continue in their sin.
We should learn from this that trusting in God is the right thing to do but that does not mean that life suddenly becomes easier. In fact, when we do trust God and move toward Him, the devil doubles down on his attacks. Therefore, we should pray more, fast more, and trust God more!
If you ask me, this is a pretty light rebuke considering who Jesus is talking to and what they have done!