Occasionally it may seem like I am telling you to stop doing [whatever], even though you didn't do that.
I probably banned a user and deleted all his posts and the post in question was directed at that banned user. Now that his posts are gone it may seem like I am talking to you, because there's no one else in the thread.
Don't get confused by that and rest assured that we are not randomly accusing users. I delete banned users and all their posts instead of leaving both around with a "banned" tag, to keep the forum clean.