Matthew Henry Presbyterian @wholebiblehenry

See here, 1. How wicked people are hardened in their wickedness: they make a mock at sin. They make a laughing matter of the sins of others, making themselves and their companions merry with that for which they should mourn, and they make a light matter of their own sins, both when they are tempted to sin and when they have committed it; they call...

John Gill Reformed Baptist @doctorgill

Fools make a mock at sin,.... At sinful actions, their own or others; they make light of them, a jest of them, call evil good, and good evil; take pleasure in doing them themselves, and in those that do them; yea, sport themselves with the mischief that arises from them unto others; they make a mock at reproofs for them, and scoff at those that...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Fools make a mock at sin--or, "Sin deludes fools." righteous . . . favour--that is, of God, instead of the punishment of sin.