Can we have some clarity here?
If someone boycotts all threads, there is no point in being a member, so that person may as well boycott threads as a Guest.

There is already a web name for someone who doesn't post at all. Lurker.

Leadfingers wants a thread for people to post to instead of posting to a more specific thread.
What we need, then, is a name for people who post to the 'wrong' thread.
Perhaps we also need a name for someone who starts a thread boycotting a specific thread, and a name for someone who starts a thread boycotting an unspecific thread.

Oh. Wait a minute. We already have.

It's a sort of fame, anyway.