Critique of "The Myth of American Inequality" by Phil Gramm

I have recently read this book in order to discuss it with some people in my life who agree with the author far more than I do. They have a tendency to dominate the conversation and be very pushy when we talk about economic issues. I can tell that there are things misleading, if not completely incorrect, about this book but I was hoping to get some help solidifying my arguments. Has anyone else read this? If so would you be willing to help me?

Things that stand out to me:

  1. a focus on just income inequality and not wealth

    1. A focus on an improvement in poverty situations but a disregard for the decline of the middle class and focusing on that being the reason and not the growing wealth of the top 10%

I have not read it but this video talks about the difference between income and wealth inequality so it could have some helpful arguments.How Wealth Inequality Spiraled Out of Control | Robert Reich - YouTube