Why is Poseidon angry with Odysseus?

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Sixteenth-century engraving by Hieronymus Wierix depicting Homer, shown as an older man with a beard and laurel wreath, wearing a draped garment. — Odyssey: A Reader’s Guide to Homer’s Epic Engraving of Homer by Hieronymus Wierix, 16th century; in the Rijksmuseum, Amsterdam.

In Homer’s Odyssey, Poseidon’s anger toward Odysseus stems from the hero's blinding of the Cyclops Polyphemus, who was the god's son.12

During his voyage home from the Trojan War, Odysseus and his men were captured and imprisoned by Polyphemus in a cave. To escape, Odysseus got the giant drunk, blinded his single eye with a sharpened stake, and led his surviving crew to safety.324

After escaping, Odysseus committed an act of hubris by boastfully revealing his true identity to the blinded giant. In response, Polyphemus prayed to his father, Poseidon, to curse Odysseus’s journey. Poseidon granted this request, which resulted in a ten-year delay of Odysseus's homecoming, characterized by numerous shipwrecks and the loss of all his companions.2413