If it's hypocritical for rich people to advocate socialism, and just self-serving theft for a poor person to advocate socialism, then no one can advocate it in good faith?

I think your quotes are a bit strawmanning: they are good responses to someone is advocating for no private property. There's a large spectrum in the middle that includes single payer insurance and free college that are still very far away from "there's no incentive for anyone to make money anymore!"