I don't know, it's one thing someone making a drunken cheeky remark one-to-one and giving a quick quip back (ie Steven's "Who said it was one finger" remark) but that's a bit different from making a speech to the whole group about a finger-banging.
But I agree, don't bloody announce it to the whole group in the first place. It's all a bit "Michelle Andrews* in year 10 got poked round the back of the beach huts".
*Names changed for privacy - apologies to any real Michelle Andrews.