There were many experiments like this, including whole countries. E.g. in North Korea, there _is_ a guaranteed basic income (at least by law), equivalent to a bowl of rice per day.
Also, a bowl of rice a day really is fundamentally different to a guaranteed income that can be spent as the recipient wishes. It is more like food stamps in the US.
Just walk away. Because you won't win any argument with that type. A very convinced yet insecure type.