Hey, I got one too! I was told, "get a life you worldly person"! Ha ha, I'm baptised, so I was never a "worldly person". So there.
My guess is that it is some bored JW kid, who thinks he's safe because Daddy's an elder or MS, yet hasn't got the brains to realise how foolish he looks because of these idiotic emailings!
Perhaps we should look on the bright side : maybe there'll be something he reads that will make him think about the WTS!