It's all a matter of personal opinion, much as some gatekeepers (like critics and academicians) would have you believe otherwise.
I'm all for "enjoy what you want" but to say that there is no objective difference in the writing of, say, Don DeLillo and Dan Brown, is ridiculous.
Clearly Dan Brown and Don DeLillo are different. They write different sorts of books that appeal to different sorts of readers. But I struggle to see how those differences make one "objectively" better than the other.
If there are objective criteria by which one could judge whether the one is better than the other, I'd like to know what they are.
It is all opinion, but there’s a difference between the opinion of Alan Kay and of someone who has two days of Python and a copy of Angry Birds.
I'm not sure I see your point.
We put more stock in the opinions of Alan Kay, because he has a better command of the relevant objective facts than does the newbie.
In 'pure literature', there are no such objective facts.
Those who have no interest in leaving their cave defend their sloth by claiming it's all a matter of personal opinion.