Ideas please.
Relax, bro. It was just friendly bants. You can take the bants, can't you?
"Plotting revenge" is for old ladies. "Imma give him the EVIL EYE!" "I'll put laxative in his coffee!!" (No man has ever done this.)
Return the favor and make fun of him a bit, in a friendly way. You'll both laugh it off. Be a man.