Why does Athena uses her powers to encourage the suitors to insult Odysseus when he is disguised as the beggar. cite a quote that exemplifies the suitor's insults

I think she wants Odysseus to see what the suiters are like. She wants to see their eventual undoing.

"Be off, old man," he cried, "from the doorway, or you shall be dragged out neck and heels. Do you not see that they are all giving me the wink, and wanting me to turn you out by force, only I do not like to do so? Get up then, and go of yourself, or we shall come to blows."