The detailed plots and loud threats of wicked people ultimately reveal their own powerlessness when faced with Divine providence. God hears their plans, but instead of reacting with concern, He meets their words with complete dismissal. He treats their threats as a joke, much like a person who laughs at an enemy they do not fear [רד״ק].
This reaction stems from the reality that these enemies have absolutely no ability to carry out their schemes. God will eventually ruin their plans and make their thoughts amount to nothing [רד״ק, שטיינזלץ, מלבי״ם]. Furthermore, the fact that God remains silent and delays their punishment does not mean He is ignoring the situation. Rather, this delay proves His absolute control. Because God can destroy them at any moment He chooses, He simply waits and mocks their useless efforts [אלשיך, אבן עזרא].
God's reaction to these specific individuals reflects a broader pattern of Divine justice. The primary approach among commentators is that this serves as a direct comparison: just as God constantly mocks the nations that deny Him, worship false gods, and act against His will, He applies that exact same dismissal to these private enemies. Another perspective connects this reaction to specific groups, focusing on the nations that actively oppress the psalmist or those who would gladly celebrate the downfall of someone fighting God's wars [מאירי, מלבי״ם].
As God's response unfolds, His dismissal grows even stronger. What begins as a dismissive laugh deepens into a profound mockery, showing an even more powerful and absolute rejection of their empty threats [מלבי״ם].