If one uses the RV.net portal, there is a "hide" button to the right of each thread. I find that adequate.
Ten years here, I've never seen anyone ask for someone else's thread to be closed down, but I know people have asked a moderator to close, or even delete, their own. Moderators will, on their own, close threads that violate forum rules, or draw too many responses that have to be edited or deleted for rules violations, particularly civility violations.
When a thread is closed, you can still read it, just cannot respond. When deleted, it is gone.
Things like this are more regularly discussed in the Forum Support forum.