 Odysseus earned Poseidon’s wrath by blinding Polyphemus.While the blinding alone may have been justifiable for the poor mistreatment by Polyphemus to his guests, Odysseus's pride was really what incurred Poseidon’s wrath.As Odysseus was leaving the island of the Cyclops behind, he mocked and talked down on Polyphemus and accused him of being impious.