the empires i usully see it applied to are the Arceans, Altairans, those for sure, and iirc the Drath.
i'd bet the Drengin get it too, and proably the Yor, but i never worry about checking their report, since i never expect them to be nice to me anyway.
i don't think i've seen the Terrans, Torains, or Korx with this predicate, but i may just have missed it.
anyway, if it always appears on the same races and not on others, then it's a fair bet it's not something having to do with the player's empire, eh?
i always just figured that it meant, "these guys are militaristic, so they are have poor(er) relations with you than a non-militaristic race would."
i've not read the other thread yet... was this idea proposed and discarded or something?