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How does Gulliver’s Travels use irony to criticize human behavior?

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Illustration of Lemuel Gulliver lying on the ground, tied down by tiny Lilliputians, with crowds and small buildings in the background, from Jonathan Swift's Gulliver's Travels. — Gulliver’s Travels Lemuel Gulliver in Lilliput, illustration from an edition of Jonathan Swift's *Gulliver's Travels*.

In Gulliver’s Travels, Jonathan Swift employs irony to expose the follies, vices, and irrationality of human behavior by contrasting humanity with various strange societies.1

Political and Social Satire: In Lilliput, Swift uses the tiny, arrogant inhabitants to mock the pettiness of human politics and religious disputes. Their absurd conflicts—such as wars fought over which end of an egg to break or political appointments based on rope-dancing skills—ironically mirror the real-world divisions between Whigs and Tories and sectarian religious strife.2
Intellectual Folly: In Book III, the Academy of Lagado serves as a travesty of the Royal Society, where intellectuals pursue impractical, lunatic projects, highlighting the absurdity of human obsession with abstract speculation over common sense.1
The Human Condition: The final voyage presents the most biting irony: the rational Houyhnhnms versus the brutish Yahoos. By forcing Gulliver to recognize that humans are essentially Yahoos, Swift critiques our inherent greed and vice. Gulliver’s subsequent rejection of his own family in favor of horses suggests that humans are incapable of achieving the pure rationality they claim to possess.12