The "fuck you, customer" is often a different way to raise esteem. The feeling is that if others read about how badass you are at not caring what others think of your projects, they will think you're badass and ask you to do contract work for them. Presumably they'll realize that only a really really uncaring badass person will write a long screed about how they really don't care.

(gah, the original post is such a long exercise is self-important posturing! Complete with careful recitation of all the opensource work he's done. And then I followed the link to the bio site to learn the guy does "Agile coaching". At that point I even briefly considered doing a facepalm gesture).