Beggar/Odysseus was welcomed in the palace. The suitors gave him enough food for him not to starve, they were reluctant. It was then that Antinous insulted Odysseus/Beggar. Odysseus without thinking about it, had a comeback to the insult Antinous had said. By then Antinous was really angry, and ended up throwing a tantrum. He threw a stool at Odysseus/Beggar, and no one agreed with this action that Antinous took. The news of what Antinous did made way to Penelope, who wasn't happy with Antionous's actions toward the beggar. She then questions the Beggar.
Hope this helped! :)