I think where this book is coming from is that true self-esteem comes from accepting ourselves as we are, the bad habits and the temper and all the stuff we tell ourselves we shouldn't have. For many people, any faults at all real or perceived make it impossible for them to approve of themselves in any way, even though they may have many fantastic attributes.
The truth is that most of us don't talk a lot about our 'dark side' the nasty thoughts we have, the bad and uncharitable stuff we do, because - well, we prefer not to think about it. I'm not sure that I advocate advertising our bad points to others, but acknowledging we aren't perfect is something most of us struggle to do. Because none of us are perfect, it's kida silly in a way to pretend we are.
I actually saw an interesting Oprah show on this very topic. Oprah said that she was stunned when her partner, Stedman, said to her "Stop kidding yourself that you are a nice person. A lot of the time you are not nice to people at all." She said that it really shocked her - but that she also felt like an enormous weight had been lifted - that the pretense to be a perfect nice person had been klilling her lol.
Thanks jazz, sounds like an interesting read.