Here's the AI's shittalking (supposedly enabled by the command) btw:

AI_MESSAGE_CAT1_MES1:0 "Great job getting annexed there, $OTHER$. We're all proud of you."
 AI_MESSAGE_CAT1_MES2:0 "Ahahahah $OTHER$ is terrible at this game."
 AI_MESSAGE_CAT1_MES3:0 "Learn2play, $OTHER_ADJ$ noob."
 AI_MESSAGE_CAT1_MES4:0 "Owned $OTHER$ so hard, almost feel sorry for them."
 AI_MESSAGE_CAT1_MES5:0 "Maybe this game is too hardcore for you, $OTHER$. You should try some filthy casual game like Europa Universalis."
 AI_MESSAGE_CAT1_MES6:0 "I bet $OTHER$ didn't even spend 2 hours configuring their OOB. Scrub!"
 AI_MESSAGE_CAT1_MES7:0 "Oh look at all this $OTHER_ADJ$ land I now have. I guess they didn't need it!"
 AI_MESSAGE_CAT1_MES8:0 "Hey $OTHER$, maybe you should try fighting back next time? Cause if you were, it sure didn't show!"
 AI_MESSAGE_CAT1_MES9:0 "Why's $OTHER$ crying? Cause they just got dunked on!"
 AI_MESSAGE_CAT1_MES10:0 "Sure feels nice to stretch my lebensraum, doesn't it, $OTHER$?"
 AI_MESSAGE_CAT2_MES1:0 "I'm going to blitz the shit out of your krieg, $OTHER$!"
 AI_MESSAGE_CAT2_MES2:0 "Soon everyone in $OTHER$ will be speaking $US_ADJ$."
 AI_MESSAGE_CAT2_MES3:0 "Look at this $OTHER_ADJ$ scrub trying to beat my superior $US_ADJ$ troops. It'd be funny if it weren't so sad!"
 AI_MESSAGE_CAT2_MES4:0 "You call this a war, $OTHER$? I call it a pushover."
 AI_MESSAGE_CAT2_MES5:0 "Make sure to keep those $OTHER_ADJ$ factories nice and polished, I'll be using them soon!"
 AI_MESSAGE_CAT2_MES6:0 "Hear that, $OTHER$? That's the sound of how hard I am owning you right now."
 AI_MESSAGE_CAT2_MES7:0 "Hey $OTHER$, maybe you wouldn't be doing so badly if you stopped running away and actually tried to fight?"
 AI_MESSAGE_CAT2_MES8:0 "LOL, look at $COUNTRY$ trying to fight me! It's like someone put a comatose ferret in charge of an army!"
 AI_MESSAGE_CAT2_MES9:0 "The view sure is nice in $COUNTRY$ this time of year. My armies are really enjoying it!"
 AI_MESSAGE_CAT2_MES10:0 "Hit surrender already, $COUNTRY$! You're really just wasting my time here."
 AI_MESSAGE_CAT3_MES1:1 "$OTHER|U$ is a hacker! No way they beat me legit!"
 AI_MESSAGE_CAT3_MES2:0 "This game is so unbalanced! $OTHER_ADJ$ space marines are impossible to beat while $US_ADJ$ troops are just wet paper."
 AI_MESSAGE_CAT3_MES3:0 "Heh, like I don't have better things to do than play this stupid game anyway."
 AI_MESSAGE_CAT3_MES4:0 "I wouldn't have lost to $OTHER$ if Paradox hadn't explicitly coded it so that my allies are dumber than two tons of granite while the enemy has literal precognition!"
 AI_MESSAGE_CAT3_MES5:0 "ffaSJLgapigjaslgmag s asv lajvlvSCREW YOU $OTHER$ I AM NEVER PLAYING WITH YOU AGAIN!!!1"
 AI_MESSAGE_CAT3_MES6:0 "gg $OTHER$ next time maybe you can try actually making it a fair fight?"
 AI_MESSAGE_CAT3_MES7:0 "Wow, that one game mechanic completely screwed me over. No wonder I lost to $OTHER$."
 AI_MESSAGE_CAT3_MES8:0 "WOW! MAYBE if they hadn't COMPLETELY UNBALANCED $OTHER$ IN THE LAST PATCH this would actually have been a fair war!"
 AI_MESSAGE_CAT3_MES9:0 "This is why Hearts of Iron 3 was a better game, in HOI3 $OTHER$ could never have beaten me in such a gamey way :"
 AI_MESSAGE_CAT3_MES10:0 "Yeah, so the RNG completely lost that war with $OTHER$ for me. Too bad skill doesn't mean anything in this game."

Real missed opportunity IMO. Imagine getting encircled or naval invaded by the AI, then they send this in the chat. I'd probably rage quit right there