The back handed 'Thank You'

I was recently reading a discussion concerning the "annoying habits" of junior players. As with such discussions there were a number of entries (with examples for tournament play), although the "they keep beating me" response would be as equally valid as any other.
But the one that always jumps out at me is the "back handed Thank You". This almost exclusively occurs in junior v junior games, and happens after one player captures the other players piece. As the Bishop sweeps across the board to remove the Queen, thanks is given as a somewhat derisive 'Thank You'. Of course the thanks offered isn't genuine, but is a way of pointing out the opponents mistake.
Often I also see the 'I meant that' follow up. Of course there is no way that a player meant to to lose the queen for nothing, but in what passes for 3rd grade banter, this seems to be the best come back available.