Magic bounce does not affect Baton pass.
>Reflects the effect of all stat lowering status moves (excluding Memento), non-damaging status condition-inducing moves, entry hazard moves, moves like Taunt and Torment, and so on back to the user.
Not only is Baton pass not a stat lowering move, status inducing move, entry hazard etc., it affects the user, not the opponent.
Since Magic bounce deflects non-damaging moves like that when targeted with them, it will not take effect whatsoever.
Hope I helped.