Ha ha. Well, maybe they *should* specially hardcode it so that if you are Attila and have a Battering Ram on Turn 15, everyone definitely *should* be AFRAID....
I had an odd situation in my current Duel map game (Immortal) where Maria Theresa had higher score than me, an army twice the size of mine, and if she offered peace at all she wanted my cities for it - and yet she had the neutral tooltip "They are afraid of your great might". I was tech leader, and had just comprehensively smashed her invasion force with the loss of about one unit, but I don't know if the AI takes account of that. She stopped asking for peace on any terms, however inflated, after that (although possibly because I nuked and later razed Yerevan - yes, I could raze it because at that point it counted as an Austrian city).
Or, alternately:
-Start game as trade-based civ. Luck into peaceful neighbors, reign in my expansion so as not to upset anyone, and play all the way through the mid-game holding friendly relations with every other leader in the game. Sign DoFs, RAs, trade/sell luxuries, and get the game I was looking for. Until...
-Turn 282: Two turns after re-upping my long-standing DoF with the Netherlands, for no apparent reason whatsoever Willy decides to denounce Arabia and Ethiopia (who had been mutual friends).
-Turn 283: Arabia and Ethiopia issue denunciations of the Netherlands & warn me about getting too close to them. I apologize.
-Turn 284: Arabia and Ethiopia denounce me.
-Turn 285: The Netherlands denounces me.
This doesn't happen to me - or, more precisely, it seems to be as common in my games for the AI to be on the receiving end of this behaviour as for me to be. Immortal game as Siam at the weekend:
- Shuffle map, turns out to be a 6-civ Pangea. Make early contact with Babylon, Egypt, Polynesia and India. Egypt covets my lands.
- Make friends with India and Babylon. Ramesses randomly turns hostile and insults me, but his army turns back and goes home when my scout spots it.
- With India and Babylon, jointly denounce Arabia. Egypt wants to be friends. So does Polynesia.
- Gandhi offers to joint-declare war on Harun al-Rashid; Nebby joins in. Egypt and Polynesia have a love-in.
- Intermittent war and peace with Arabia; the five-civ alliance remains stable for most of the game.
- Random denunciation. Gandhi doesn't like Ramesses, it seems. Nebby's not too fond of him either.
- Alliance splits into India/Babylon vs. Egypt/Polynesia. I remain neutral (since I don't want the 'war vs. friends' hit for declaring war on Egypt. As annoyed as I am with Nebuchadnezzar for planting Borsippa on a site I wanted for my third city, I like Nebby), but when the war is fought mainly in the middle of my territory, I refuse to reopen borders to Egypt and Polynesia, tacitly supporting my older allies. I have negatives with everyone for DoFs with their enemies, but no one refuses renewals of DoFs (except, eventually, Polynesia, but only after I've refused all their deals, preparing for likely war - oh, and accidentally hit "Stop spying on me", which didn't impress Kamenaha).
- Peace breaks out, and Babylon and India go back to their usual hobby of attacking Arabia, finally making progress.
-I turn down approaches by Babylon and India to go to war with Polynesia, and answer "how dare you?" whenever Ramesses wants me to fight Nebuchadnezzar. Then I'm approached with a war offer against Polynesia ... by his old ally Ramesses. This one I accept, and Ramesses proceeds to nuke every Polynesian city.
By the time the game ended (Egyptian cultural victory, much to my surprise), Polynesia and Arabia were down to a city each, while the only wars I'd been involved in were ones I'd started or been approached to start. Practically every AI civ had been the target of either irrational game-long dislike (Harun), or apparent backstabbing - or at least deterioration of their relations (Ramesses vs. Nebuchadnezzar, Ramesses vs. Kamenaha); possibly the fact that Kamenaha was getting friendly with Harun, and captured a city-state, turned his former ally against him. By contrast I ended the game launching a joint attack on Polynesian cities with the one civ that had been hostile towards me at the start of the game and friendly with Polynesia.
Your characterisation seems more accurate for vanilla Civ V, but I think the AI now recognises that a human player it knows is likely to be superior to itself can be used as an asset. If you're an AI "playing to win", you aren't going to win by trying to beat a superior player in combat, while by contrast if you're an AI whose key rival is a similar AI, the best way for you to get an edge is to "recruit" the human to do your fighting for you. Everyone in that game was eager to have me join in wars on their side. Sure, this doesn't always happen, particularly as the AI likes to try rushing you before you can become either a threat or an asset, but while this is an extreme case - in which I was able to dictate terms and decide my allies without repercussions throughout the entire game - something similar is not uncommon.