@inthehands I don’t think it’s entirely fair to put full responsibility on the “reply guy”. OP knows what kind of platform they post on. They are aware that there will be a Reply button under their post.
If OP doesn’t want a reply they should use a medium that doesn’t provide an opportunity for reply. A blog with disabled comments, a static web page, or even an offline medium like a paper journal. Or be ready to ignore all replies to that post.
We can blame platform’s affordances all we want but we can not deny that the choice of platform is entirely on the OP and they are at least partially responsible for the outcomes of that choice.