What does Proverbs 21:24 mean?

This statement provides a handy reference for other proverbs where Solomon refers to a "scoffer" or "mocker" (Proverbs 9:7; 13:1; 15:12; 24:9). This person is conceited and overconfident, with behavior betraying a smug type of egotism. The scoffer doesn't necessarily brag or flaunt their attitude. However, they think and act as if their opinion is as good as fact; as if nothing, even God Himself, is sufficient to change their mind.

Attitudes associated with a "scoffer" mock others, including God. Asaph describes wicked men as scoffers who "set their mouths against the heavens" (Psalm 73:9). These people have a high opinion of themselves, presuming themselves more important than others, including God. Genesis 11 relates the story of a generation so arrogant that its people thought they should be remembered forever. They planned to build a city with an immense tower, probably as a way of claiming they were immune to another great flood (Genesis 11:4). Despite their egomania, God judged the arrogant builders by confusing their language and scattering them over the face of the earth (Genesis 11:7–8). Humility will come to all people, either by submission to the Creator or because of His judgment (Matthew 23:12; Proverbs 3:34–35).