I've been responding to posts to me, which have been quite a lot. I don't actually know what you are referring to so probably missed it, like I missed when someone posted a link before, this is a very long thread. If I've just posted straight after someone, then if their post appeared while I was typing mine, again, probably not read it.
However, I'm not sure why someone not responding to every poster on a thread is an issue? I mean, I've been replying to a poster who was posting increasingly unhinged stuff, and yet no one else seemed to notice the unhinged stuff. Or maybe they didn't want to challenge it. Or maybe they didn't have a problem with it.
As that poster is now revealed to have been a troll, it turns out I was right to have a problem with what they were posting.