Sure I have!
The one the character makes when the players uses CaGI is extra mean!
Why are you assuming the taunts are all identical? The more reasonable thing to assume is the one that corresponds to the use of CaGI is different.
To my mind, your example is a willful attempt to sabotage the association of the mechanic and the fiction by declaring all the taunts to be identical from the viewpoint of the character. If you choose to declare the CaGI taunt as different, more emphatic, ruder, whatever, from the character's POV then your problem goes away.
The reason the mechanic is disassociated is its use has no bearing on character action or frankly, choice.
The power works regardless of taunt (un)used or (in)action taken by the character. A player can decide to try and add colour to the power use -- but that does not associate the power with character choice. I've used manoeuvres like CaGI that are associated in other game systems (Bluff check to appear to stumble and sraw the opponent in, minor charm-like spell in combat, a bardic taunt). In each of those situations the character makes a choice and allocates resources/actions accordingly and tries to achieve the result. That's not how the pre-errata CaGI operates. CaGI depends entirely on player choice and any attempt to attach it to fiction is up to the player's intiative.
Imagine a scenario where players Alice and Carol are running characters Ted and Bob, respectively.
Alice and Carol are good friends. Ted and Bob are rivals and don't like one another. In fact, Ted has been overheard plotting Bob's death.
A fight breaks out and the nasty mean opponent is tearing Bob a new one. Ted is feeling triumphant. Alice on the other hand is feeling queasy. She knows Carol really likes playing Bob. So Alice plays CaGI. Ted hasn't done anything to try and attract the meanies attention. He wants Bob to eat dirt. Suddenly the critter turns and beelines for him so Ted carves it up.
The power activation rests entirely outside the actions of the character and neither the character nor anything else in the environment can associate any reason to its activation.