The #1 trouble maker around here is GUEST.

Not so, because GUEST (nameless) isn't a person, it's a label used by a load of people who for a number of reasons choose to cloak themselves. Some are no doubt members, some are regular hangers-on around here, including at least one who and some are occasional visitors.   

I don't like the practice, can't see any good reason for it, and I'd like to see a requirement that anyone posting as GUEST has to put in some kind of name, however temporary. That wouldn't involve any kind of censorship and could save a lot of confusion. Maybe it'll happen some time, bit there's no point in banging on about it. However it's a mistake to create a fantasy about GUEST (nameless) being some kind of hovering consistent presence. The namelessness is irritating sometimes, but it's the abuse and the knee jerk response to it that's the problem, whoever is responsible for it from time to time.
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"I am now out of any thread that *** posts to..." I think that's the wrong way to deal with that kind of situation, Sorcha. It'd just be inviting whoever it was you were trying to avoid to chase you round Mudcat. Much better systematically to skip any posts under the name involved.