I think that once you get horrible honor rating you get hated by some number of lords, regardless of their nationality (those old-school chivalry fans
), coz I have intact by that honor-plague lords in my faction as well
EDIT
Well, after recalling some facts from mah game, I think I know where things could get ugly:
1) I joined Crusader States
2) At war with Mamluks (have been raiding villages, but did not checked honor rating\side text info)
3) Finished off Mamlukes, short period of no war.
4) Not wanting to disband my 40 knights, I figured that army should feed itself and went for my own (no official war) anti-mongol crusade (with looting villages, but still didn't checked the side texts). I thing this is the point where things could go wrong - I mean getting "- honor" for looting factions villages I'm not at war with. But this self-made crusade wasn't long enough, coz Roman Empire (red one) declared war on us. That's when I noticed I'm getting "-honor" for looting villages - but now they belong to our enemies. I'm so confused.
5) Another war started with Kingdom of Sicily, and again I gain "-honor" for raids in its villages.
Could honor system mess up after I attacked nation that was neutral to Crusader States? Coz now I'm 100% sure I'm dishonored every time I loot
village of our enemy.
+
I lose honor when I choose "you're my prisoner now". Not rly sure it wasn't neutral lord though