Have emailed to MNHQ about this, but am disappointed with their reply so want to address it in public.
There is a thread in AIBU with a title "To want to smack my mother in law"
And while i get where the wishy-washy OP is coming from - i don't find this kind of title acceptable. Really, i can't see why a violent thread title against a woman should stand. It is hugely offensive to talk about violence against anyone in this casual way. And when challenged to be told "meh, she doesn't really mean actual literal violence" (me paraphrasing. The OP said it's a "joke" so - hahahaha - we let it stand is what MN reply to me boils down to)
That is rather less than impressive given some of the deletions we put up with in other areas. If i were an MIL I'd be less than impressed with this decision.