Or they just don't give enough shit to even bother replying to it. There's that too.
True.
When it becomes obvious to me someone is just looking for a fight or they are being a brick wall or acting stupid, I find them not worth it. Same as when someone is being rude and nasty to me, I ignore them, that's what I do these days. I sometimes think people play dumb on purpose to give you a hard time. To me it ain't worth it. I bet they do it to piss you off. They full well know what you are saying and understand but decide to say irrelevant things and pretend to not get what you are saying when it's obvious and clear what your post is about. I also think some people deliberately take things out of context what you say just for a fight and to be mean and bully you.
Some people just want a fight so they troll that way. Better to ignore them than wasting your time talking to them.