RooRoo, threads, especially ones that go on forever, are bound to drift. Think of it as a verbal conversation--it's the same thing only written. That's the best analogy I can come up with. Bottom line is if the thread irritates you, don't read it. If you do choose to read it, then just roll your eyes and move on when a post annoys you.
There are a lot of posts that aren't mod worthy but provoke a "are you kidding me with this?" in my head, and if I feel strongly enough about it I will post.