I mean…

When a question is asked, it seems lately more and more people are starting their answer with “I mean…”. How does that make sense? That should be used to clarify something that has already been said. There is no reason to start with “I mean” if you haven’t said anything earlier. What is the sense in that? So what do you mean? Are you stalling for time? Is it a placeholder? It just doesn’t make sense.
End rant.