I don't think it has to do with status, or with cabin. Kettle are those who are unfamiliar with and unprepared for the flying experience. You'll see them repacking at the ticket counter when surprised by fees for overweight or extra pieces of luggage. You'll see them in the security lanes with large bottles of liquids. You'll see them becoming gate lice, trying to board well before their group is called. You'll see them not stowing bags properly, reclining before takeoff, and surprised that the stewardess doesn't have a pillow for them.

An elite on a different airline usually isn't a kettle. A first time flyer may not be either, if they've done a little research before hand on what to expect.