Hm, maybe a new term for someone who is badly behaved or has inappropriate poly etiquette is in order.... ?
No short terms, sadly. On my good days, I identify 'em like this:
- has some growing to do
- not ready for X
- not accustomed to Y
- needs to show more respect for Z
On my bad days, I usually settle for one of these: [insert expletive], [insert a different expletive], [a third expletive], etc.
I'm half tempted to suggest something awful like 'amorasaurus' or 'polysaurus', to imply outdated ideas about love/relationships that don't work well in the poly context.
Someone, please do better!