A fool slanders (Proverbs 10:18), treats wrong-doing like a joke (10:23), is reckless and careless (14:16), doesn’t take pleasure in understanding (18:2), is blind to his own ignorance (12:15), flaunts his folly (13:16), and feeds on foolishness (15:14).

He spurns godly rebuke (17:10), walks into fights (18:6), ruins himself (18:7), lacks integrity (19:1), rants, ridicules (29:9), and takes pleasure in expressing ignorant opinions (18:2).

He is inveterately foolish (26:11), hopelessly arrogant (26:12), aggravating (27:3), self-trusting (28:26), and unrestrained (29:11).

His companions suffer harm (13:20). He brings grief to his parents (17:25). He deserves the rod (14:3). Honorable men avoid him (20:3). It is not fitting to give him honor (26:1). Those who play according to his rules become like him (26:4).

He can’t be trusted to relay information (26:6). Proverbs are useless in his mouth (26:7). He devours precious treasure (21:20) and despises good sense (23:9).

So you definitely, definitely, definitely should not give him what is holy, or cast pearls before him. He will only trample them and attack you (Matthew 7:6).