People say "you'll probably disagree" as a defense mechanism. They preemptively expect a rejection, and make it known, in order to make it hurt less. Works in a similar way as self-deprecating humor. "You can't hurt me, if i hurt myself first." "You can't reject me, if I reject myself/you first."
I myself, got triggered by this thread and it's display of emotionally immaturity, because I have some of it myself, and I dislike it with a passion.
I've noted that HN is a forum full of emotionally immature people that are usually polite in the way they show it. This little thread is a perfect example of it. Very off putting, still the threads are sometimes interesting, if we can accept this fact and try to look at the discussion itself.
I think you're projecting something here. I'm not triggered by his insecurity and don't see it in myself. I just think begging for votes doesn't belong here, and begging for votes through reverse-psychology doesn't either. Let the content of your comment stand on its own merits.
Every comment that has that line can be improved by leaving it out.