I haven’t read the book but from Goodreads description I’m not seeing any new idea’s.

For decades, we’ve been told that positive thinking is the key to a happy, rich life. “F**k positivity,” Mark Manson says. “Let’s be honest, shit is f**ked and we have to live with it.” In his wildly popular Internet blog, Mason doesn’t sugarcoat or equivocate. He tells it like it is—a dose of raw, refreshing, honest truth that is sorely lacking today. The Subtle Art of Not Giving a F**k is his antidote to the coddling, let’s-all-feel-good mindset that has infected American society and spoiled a generation, rewarding them with gold medals just for showing up.

Personally I don’t know what “telling it like it is” actually means other than that it gives permission to use poor language and be crass. I’m swearing and being rude so I must be “telling it like it is” and because I’m telling it like it is what I’m saying must be true… and worth listening to…

The writer has a issue with coddling and the think positive movement which leaning to a tendency of being a ‘defensive pessimist’ I might agree with however my experience those that ‘tell it like it is’ is that it tends to be one-sided, ether or, and I believe there is a time for all things. The question becomes one of discernment, which it seems is how the author also ends his rant.

So maybe it’s a generational thing. I don’t think swearing is necessary, and though it might get our attention it also distracts

I don’t know there are lots of books on the subject he talking about

Don’t Sweat the Small Stuff … and it’s all small stuff: Simple Ways to Keep the Little Things from Taking over Your Life – by Richard Carlson

I liked The Positive Power Of Negative Thinking – by Julie Noremm
For many people, positive thinking is an ineffective strategy–and often an obstacle–for successfully coping with the anxieties and pressures of modern life. For example when I am giving a problem , my first thoughts are on what could go wrong and then what I need to do in order to ensure those things don’t happen. This process may seem (and is seen by many) to be negative but it’s not. It’s just a process and when followed I’m very optimistic that I will solve the problem. But tell me to not worry about what might go wrong and just believe that all will work itself out and well I’m going to become stressed. That said for other areas in my life, for example travel, I’m a strategic optimist.

You don’t want a strategic optimist building your home but you also don’t want a defensive pessimist selling it.

I would also recommend Quiet: The Power of Introverts in a World That Can’t Stop Talking by Susan Cain.