Faced with the schemes of nations plotting to rebel against God, the divine response is one of continuous, ongoing action [רש"י]. The primary approach among commentators is that the image of God laughing and mocking is a metaphor using human concepts. It illustrates how one might react to an attacker who is ultimately insignificant. To God, the plans of these nations are entirely empty and doomed to fail [רד"ק, מאירי, ביאור שטיינזלץ].
The description of God sitting in heaven carries multiple layers of meaning. On one hand, it highlights His eternal, everlasting existence in stark contrast to the mortal humans scheming on earth [רד"ק]. On the other hand, it demonstrates absolute superiority. Even a weak person positioned high above holds a strategic advantage over someone below; this is certainly true for the Creator of the universe [מצודת דוד].
The reaction involves two distinct expressions of scorn: laughing and mocking [מצודת דוד]. While laughter can sometimes stem from joy, mockery is always an intentional, severe form of disdain [מלבי"ם]. This raises a question: why does God simply laugh rather than punish the wicked immediately? The explanation is that the laughter itself contains the punishment. Unlike anger, which provides a clear and direct response, laughter creates the illusion that God is not paying attention. This gives the wicked a false sense of security. In reality, this divine laughter sets the stage for a sudden, devastating punishment and deep shame that will strike them once their sins reach their limit [מלבי"ם, תורה תמימה].
Another layer of meaning is found in the two different titles used for God, which represent two distinct ways He guides the world. The image of Him sitting in heaven reflects a state where God appears to hide His face, seemingly withdrawing His presence to the upper realms. However, the subsequent use of His title as Lord represents His active presence and mastery over the earth. This teaches that the Divine Presence has never abandoned the people of Israel, even in their exile. It is this very earthly presence that mocks the nations who falsely believe they have severed the bond between God and His people [אלשיך, חומת אנך, מלבי"ם].