Gary Becker, at a 2007 AEA reception for a documentary on Milton Friedman, gave a brief informal testimonial to his teacher, colleague, and friend. He told of sharing a cab, during which Friedman discussed economics with the cab driver. When they reached their destination, Friedman was slow to leave the cab, wanting to raise a few more ideas with the driver. Friedman was all about the ideas, and not at all about the status of the person discussing the ideas.
Diamond, Arthur M. Jr., "Review of Cord and Hammond, eds. Milton Friedman: Contributions to Economics and Public Policy" (2017). Economics Faculty Publications. 30.