Ultimately one must be prepared to educate and defend one's own self, for truely helpful individuals and the staff cannot allways be present. - Kuskovian
Your post summed up well existing counter-measures but I come to a different conclusion than you.
You conclude because "the staff cannot always be present" it's up to the newbie sub to "defend one's own self". That's at variance with "If a member is harassing you or in some way disrespecting you, please let a chat mod or admin know, rather then taking the matter into your own hands--please do not be a vilgilante- that is why we have chat staff!". I know you did not mean be a vigilante but nonetheless it's not quite as simple as self-defence.
I take the view that if there's a problem, don't ignore it fix it! Finding workable solutions is of course not easy but at least you are facing up to the problem and trying to do something about it. That raises the question is, is there a problem? You seem to suggest "No" because the subbie can either ignore or report it. I would argue "Yes" because this thread demonstrates it is a matter of ongoing concern for many people.
Let me compare it to rape. You can ignore the rapist but the damage may already have been done and the rapist is free to attack again, probably encouraged to do so since he knows all that happens is he is ignored, and ignoring does not stop the next rapist. Reporting is the way but the victim must report the crime. How many rapes go unreported. Did juicysub complain. How many subbies in the thread said the same has happened to them and how many complained (good question ladies - why didn't you). Are we saying it's not a problem because the victim did not complain. Come on let's get real here, a newbie is highly unlikely to complain,that's one of the reasons they are targeted, and she probably thinks it's normal here and simply leaves. If there was a known a serial rapist in the community would the local police have a quiet word with him and would the mobster tell him that if he does it again he'll get his dick cut off.
Agreed my rape analagy may not be fair, but it does demonstrate that if there is a problem there may be more that needs to be done than simply saying ignore it or report it.
If I were subbie and a Dom told me in whisper I was not a true submissive, I'd be inclined to reply in public "Are you telling me Sir Blackheart that if I don't fall to my knees and obey your every command that I'm not a true submissive?". Then lean back and smile as all the subbies in room sharpened their claws and ripped the guy to shreds.
A wrongdoer is often a man who has left something undone, not always one who has done something. - Marcus Aurelius