These are posts by the entitled kiddies who - IMO, due to facebook influence - feel they absolutely MUST reply to or comment on everything. Whether they have anything useful to contribute or not. Not one has ever made any contribution beyond a useless or snarky post. Mostly they are just showing their immaturity with these kind of posts. Many either move on or keep it up until they get banned. We do look at posting history - so a really snarky comment that may have just gotten a warning can become a full ban if they have a lot of these type posts.
I think you've hit the nail on the head right there. Thanks for this reply, I may quote it sometime.