The book raises striking and specific points about how as whites we have biases toward race while pretending we are colorblind. She states specific examples, and outlays practical way forward.
Most of the lower star ratings of this book seem to be exhibiting the exact fragility she outlines, and really only prove to drive her point home further.
Even more, they seem to ignore the very clear outlining in the book of difference between personal and systemic racism. That the way forward is to stop taking things personally when accused of being a part of the problem, and instead to look to ways to contribute to the dismantiling of systems in place. Few whites are racist, but all whites participate in racist systems. It's on us to learn to step into the discomfort and let healing begin. That's what this book addresses.