When I was 17, mom burst into my room after we'd had an argument, and she threw this book onto my bed where I was sitting, and yelled that she suggest I read it because she thought I was mean. Although I skimmed it, I could see the larger points of the book were basically communication "tricks" for personal gain, and while a lot of those tips might seem valuable for people trying to gain professional networking success/leverage. I didn't need that. I know how to be civil, am able to make and nurture genuine connections, and show appreciation, all without being fake about it. I also do NOT believe in avoiding criticism where it's due, which is something my mom (and the book) adhered to. I believe all the above is simply being sincere vs manipulative. Sincerity is hugely lacking in society, and I stay true to myself by refusing to play fake just to "be nice" to others.