Regarding titles for clergy
1. Any clergy of the mainline (i.e. non vagante) EO, OO, and EO/OO Old Calendarist Churches shall be called by their proper title or salutation, or a respectable abbreviation of such. Extreme abbreviations are only appropriate for institutions or large groups (i.e. MP for "Moscow Patriarchate" not "Patriarch of Moscow"). All such references should be made with respect following proper decorum (i.e. no inclusion of pejoratives or other personal attacks).
E.g. When referring to the current Archbishop of Athens and all Greece, "Archbishop Ieronymos of Athens," "Archbishop Ieronymos," "His Beatitude Ieronymos of Athens," "His Beatitude Ieronymos," and "the Archbishop of Athens," etc., would all be appropriate; "Ieronymos of Athens," "Ieronymos," or "Jeronimo" would not be appropriate.
2. Any man formerly a clergyman of one of the groups named in #1 who has been removed from clerical status without the dispute of or transfer to the other 2 groups shall not be referred to as an active clergyman, but either by their lay name, or as a former clergyman. Again, such references should be made without pejoratives or personal attacks.
E.g. If a man named Paul Smith was defrocked from the priesthood (for abusing children, preaching heresy, etc.), you can call him "Mr. Paul Smith," "former priest Paul Smith," or even "disgraced former priest Paul Smith," but not, "Paul Smith the rapist" or "the heretic Paul Smith," etc.
3. Any person who is a clergyman of a group not listed in #1 can either be referred to by their official clerical title, or by a corresponding title appropriate with their position; however, this must be done without pejorative, maintaining a minimal state of decorum.
E.g. The current Roman (Latin) Catholic Pope of Rome can be referred to as Pope Benedict XVI, Pope Benedict, the Pope of Rome, etc.. It would not be appropriate to call him Cardinal Ratzinger (since that is no longer his title in the RCC), Joseph Ratzinger, the Heretic, Joe, or any other pejorative, diminutive, or other form of insult.
4. Defrocked clergy who go to other jurisdictions/groups should be treated with usual courtesies; those who do not go to other groups shall be treated as laymen/monks.
As for vagantes, we can use the most basic definition: groups with only 1-2 bishops.