Dude, people are not judging you. And, the world is not turning around you either. So, relax a little bit. If this is how you are going to cope with life, it is fine. But, you might appear to react to something that doesn't exist. Just saying... People are usually nice, and when they aren't, be sorry for them, not angry.
I don't think the author was making the point that people are always judging you, the author is saying to get over or disregard the fact the people may judge you. It has to be a common mindset that people care what others think about them.
It isn't for antisocial 12 year olds, you're right. Its for Entrepreneurs and Technologists, many of whom can be very sensitive to what others think.
While this isn't the best article in the world, I think its a good lessor (or reminder) to give less of a fuck. I know giving less of a fuck did my life a world of good, but sometimes I go off and start becoming sensitive to other peoples thoughts and opinions. Its a good reminder that what other people think about you shouldn't have such a strong hold over you.
Just my 0.02 cents.