It's incredibly obnoxious behavior, but with limited moderation resources, we have to pick and choose our battles. I've noticed that a lot of people with this tendency are new. If I started infracting people for it, I'd mostly just be wasting time because a lot of newbies leave after a couple posts. Because of that, I've chosen to just give up on this one and fight battles more likely to be relevant to the long-term health of the forums.
That said, when dealing with noise posts, it's generally best to ignore them entirely. Pointing it out in the thread often derails the thread even further, as ALSO seen earlier in this thread. The only thing worse than three redundant posts is thirty posts arguing about how stupid those three posts are.