Initially, this book seemed like a deliberately over-the-top book satirising both the target of the book and the type of author that writes this kind of book - both of which are highly deserving of this treatment. However, as the book progressed, it became clear that the author was sincere in the views being espoused. The thing is, though, what the author is yearning to go back to (and extremely intolerant of those who don't conform to it) is essentially a fiction, certainly as far as being the mainstream of American masculinity goes.
In truth, for most people, I expect that the boorish author would be as annoying to be around as the infantilized millennials under discussion.