Actually, the AI does not seem to tell each other to get out. If they did, then they should not be able to attack me even though they have to go through twenty or more squares through neutral territory (Other Civs)...
As is, they can, but I can't... I'm able to get like five squares behind neutral civilizations borders with infantry, if I'm lucky. My enemy can move dussins of slow infantry units through any numer of squares without having to withdraw or declare war to the neutral Civilization i question... i have seen this happen to many times and I get as frustrated everytime.
I feel that the AI shoud be programed to the same limits as I have in this respect... if the AI get some bonus in production or reserach I do not mind... but both I and the AI should play by the same rules of the game. I do not like this kind of AI cheating... it makes me irritated when I play... and thats not a good thing...
Also the settler thing is stupid to, sometimes you tell them to go away, they simply say they will but continue on anyway. The only thing you can do is to declare war or put units in their way. More anoying is the knowledge that other civs will gladly let each others settlers pass by without interfering, you recognice this by different civilizations cities that are everyware mingeled together here and there, but I can't do the same.
This is somewhat a brooken feature in the game, that sometimes get me so frustrated I quit playing, only to come back a few weeks later thinking things have changed... stupid me