Why is the cycops not impressed when Odysseus threatens him with the vengeance of Zeus?

The Cyclops, Polyphemus, is not impressed by Odysseus's threat of Zeus's vengeance because he does not respect the power of the gods or their authority over him. He believes that he is stronger than any deity, as he is a giant and lives in isolation, away from the influence of divine beings. Additionally, Polyphemus is accustomed to being unchallenged, making him dismissive of Odysseus's claims. This arrogance ultimately leads to his downfall, as he underestimates both Odysseus and the wrath of the gods.