I assume not only do they believe what they are writing but would believe you and I just don't "get it".
To be fair, there are things I am really into that seem just as ridiculous to an outsider/non-connoisseur. Microtonal music for example. I have seen youtube comments before on pieces I really do love saying that people must be pretending to like this music because it sounds so awful to them.
Or wine tasting comes to mind. I love wine but the wine tasting connoisseur seems ridiculous to me. We really are having two different experiences though.
The writers probably are perceiving these things and not just making them up.
The thing is I can understand wine tasting, or microtonal music, or poetry, or lots of other things. I don't really "get" those things either, but I can see how it's something that other people do "get". I do understand it on some level.
But this kind of stuff ... I don't really understand how anyone can say something like that with a straight face. But maybe that's just a failure of empathy on my part *shrug*
You assume it's people writing it. It was probably written by AI. Nobody cares.