Because Odysseaus blinded and insulted his son Polyphemos the Cyclops.
One of poseidon's weaknesses was his anger. With it, he could start earthquakes.
his weakness was anger and because of his anger he would start earthquakes
Anger and the sky
Poseidon
i do not know and you don't ether
Polyphemus is the son of Poseidon, so injuring him would anger Poseidon as it is an attack on his own flesh and blood. In Greek mythology, gods take offense when harm is done to their offspring as it is seen as a direct challenge to their authority and power.
got mad at one of his bothers i think
because he has anger issues
His weakness is not being able to control his anger.
Poseidon remained angry with Odysseus throughout his journey home in "The Odyssey." This anger stemmed from Odysseus blinding Poseidon's son, the Cyclops Polyphemus. Poseidon's wrath caused numerous obstacles and delays for Odysseus as he tried to return to Ithaca. It wasn't until Odysseus finally reached home and made sacrifices to appease Poseidon that his anger began to subside.
Poseidon is the father of Polyphemus, the Cyclops encountered by Odysseus in Homer's epic poem, the Odyssey. Poseidon plays a role in Polyphemus' story when Odysseus blinds him, resulting in Poseidon's anger towards Odysseus for causing harm to his son.
He blinded Poseidon's son, the Cyclops who trapped Odysseus and his crew in his cave.