Giving respect to someone who lacks the character to handle it is an exercise in futility, and often a recipe for disaster. King Solomon captures this reality through a striking image of a stone being handled in an unusual way.
The primary approach among commentators envisions a stone loaded into a sling. This highlights the fleeting nature of such misplaced respect. Just as a stone sits in a sling only for a brief moment before being hurled away, the status granted to a foolish person is short-lived. He will inevitably act in ways that quickly bring him disgrace [רש"י, מצודת דוד]. Beyond being temporary, honoring someone unworthy carries unpredictable risks, as there is no telling where the resulting damage might land [ביאור שטיינזלץ].
This danger becomes especially clear when the honor takes the form of sharing deep wisdom with a fool. He may take these wise answers and use them as a weapon, much like a stone launched from a sling, twisting them into harmful ideas that damage innocent people [מלבי"ם]. In a similar vein, sharing sacred teachings with an unworthy student is compared to the senseless act of tossing a stone as an offering to an idol [רש"י].
A contrasting perspective suggests the imagery is not about launching a weapon, but rather holding it back. By tying a stone tightly within the pouch of a sling, it is prevented from flying out and causing harm. In this view, honoring a fool is a calculated act of appeasement. It is meant to tie his hands and stop him from acting on his destructive impulses [אלשיך].
Other commentators view the imagery differently, seeing it as a symbol of complete mismatch rather than a weapon. They picture the scene as tossing a precious gem into a massive heap of ordinary building rubble. In such a pile, the gem's worth is entirely lost and ignored. True honor, which is rooted in wisdom, belongs only with the wise; when given to a fool, it simply cannot be recognized or sustained [רלב"ג, עמנואל הרומי]. Alternatively, the image is understood as taking a worthless pebble or a piece of broken pottery and wrapping it in a magnificent, luxurious garment. This stark contrast perfectly captures the sheer absurdity of dressing an undeserving person in honor [אבן עזרא].