Book 9- The Cyclops
Sounds like Odysseus is getting a wake-up call.
Odysseus was too conceited in his "clever" plan to get away. As they were leaving, even when his crew begged him to stop talking, he continually bragged and wanted the cyclops to know who was the one who defeated him. Odysseus revealed his name to the cyclops and he replied with this. Odysseus would have easily gotten away with it if he hadn't have gotten big-headed.
Polyphemus is better than gods.
Even if this cyclops isn't a god, he has connections. In this world, you never know who your talking to our what they could be. You might think it's just a stupid cyclops, but it turns out they don't need any of the gods and are far better on their own. In other words, Polyphemus thinks he's was better than the gods.
When they were traveling they began to get hungry so they urged Odysseus to get some food from the cave, without asking. They didn't want to stay and receive permission so they told him to just take it. Odysseus, being the person he was, knew he couldn't just take it so he waited around just to ask. It was expected that the owner of the cave would easily give them what they wanted, but they were shocked when that was not the case.