Counter-Banter

(Verb)
If one ‘Counter-Banters’, it is the action of deciding not to take part in some casual banter that a mate is having with you; it is to kill an exchange of banter stone-dead.

“Ah that’s a shame, I was only being sarcastic and trying to have a laugh, instead you decided to take the matter seriously and shut me down. That was a real case of counter-bantering.”