I see. Perhaps I should be clear then, I don't consider anyone to be in a privileged position when it comes to art, I consider the entire idea to be absurd. Art is a label of convenience, nothing more and while having operating descriptive definitions of art is useful, normative ideas about art (the 'moral value' of art for example), are unhelpful. So, when someone criticises science fiction, or comic books, or video games, or interactive stories, or children's literature, or modern art, or any of the myriad of things people love to criticise and claim are not art I will generally take the most belligerent position possible in opposition to them, asserting that while I don't think there is a standard, if we are going to impose an arbitrary one I chose the one which undermines their pet genre, in the case of people criticising science fiction this is generally the 'high art - low art' types who think that dropping out of a 3 year college degree in ancient who-gives-a-fuck and media studies gives them a deep insight into the world because they spent all their time playing in a boring alternative band and pretending that impenetrable bullshit is 'really deep' and that they are better than the people whose study actually makes a material difference to the world because those people "just don't get it".
It isn't that I think this is a good standard, no standard is good, they are all arbitrary. I pick this one when someone else implies there is a standard to piss those people off and force them to defend their arbitrary bullshit. If you agree there is no standard, that it is all subjective and that people who like the My Little Pony theme song are no better or worse than people who like Chopin then we're all cool.