Actually, it's the necroing aspect that's the perceived problem, not the argument part. People generally don't like it when threads that haven't been posted in for a while suddenly get a new post, especially if it's continuing a line of discussion that everyone else involved dropped and/or forgot about a long time ago.
Also, the person you originally replied to was, at the time of this post, last seen on Saturday, so I think it's safe to say they're still alive. I think Couch referenced that statement to highlight a significant issue with necroing threads, not because it's what's happened here (which it probably isn't).