When your team mate threatens to afk and you say "ok" and then your mid blames you for it

I usually blame the person who threatens to go afk for going afk, but that just seems to be me.

I've done that once. I was playing Rammus. So the obvious reply I made was OK.

My usual response when someone threatens to afk has simply become "do it"

I always try getting them to go afk so they get banned. I don't like being threatened.