Why does it have to be scientific? Lots of people write their thoughts on the world and the people in it. Why would a blog called “skin contact” need hard facts?
It doesn't. But that is the GPs own projection when encountering this OPs work. It's the modern abuse of the scientific to insulate yourself from all things you cannot do or do not understand, or don't wish to face.
Like someone evaluating literature as if it's an academic paper. Hilarious. Just ego protection from things you don't wish to face. Carpe Diem! not "Scientific Blinkers" sold on amazon, $1 for a 10-pack. Wear it and you'll never be awed again!
Worship an idol of false objectivity, and demonize the subjective - to hide, when objective and subjective are both seeing and making from different points of view. But those trapped objectifying the world - an authoritarian abuse of science when science is observation - you're only harming yourself, and trying to turn your dynamic human-ness into a fixed robot!
My use of "scientific" was partly a play on words, because it's a natural accompaniment to "observation". But note that I said "in any sense". We don't have to don lab coats and acquire lofty job titles to take a kind of scientific approach to our own beliefs. And formulating a personal "theory of mind" is indeed necessary to navigate the social world. The crucial part is this: "What does the author do to confirm or refute her psychological theories about others?"
Painting weddings presents good opportunities to observe the interactions of strangers. On the other hand, it does not present good opportunities to come to know strangers intimately, which is the only way to confirm or disconfirm your superficial observations of them. The wedding guests are unlikely to ever become the hired hand's close friend, lover, or relative. If the article author is somehow an expert at reading people, that expertise was assuredly not acquired by painting weddings. At best, preexisting expertise could be practiced there. Reading the author's list, however, I'm quite skeptical. She appears to be someone who is judgmental and jumps to unwarranted generalizations based on anecdotal evidence.
Most of us are pretty good at reading other people. That's natural, not magical. But pretty good is fallible at best, and overconfidence in our own abilities is another natural human trait. You can easily become overconfident by having a few lucky successes. The most troubling combination is overconfidence and charisma, which allows you to deceive not only yourself but many others.