A user on hacker news years ago put it well like this:
"Any community that gets its laughs by pretending to be idiots will eventually be flooded by actual idiots who mistakenly believe that they're in good company"
"Any community that gets its laughs by pretending to be idiots will eventually be flooded by actual idiots who mistakenly believe that they're in good company"
"Without a winking smiley or other blatant display of humor, it is utterly impossible to parody a Creationist in such a way that someone won't mistake for the genuine article."
Since, in the long term, there is always less people in on the joke than new followers, you are guaranteed that the community is going to be taken over in the end.
"Ironic shitposting is still shitposting"
Edit: Ok, I stand corrected. After checking it turns out the HN post is probably the source. It's just I saw it posted in its original form on 4chan most often.
I don't like the shitposts or trolling, but always fascinated by them as a social and psychological phenomenon, and the way how idea travels and spreads.