Yes telling him Santa might be going too far. Tell em thanks for calling you the "c" word then tell em he should tell that to his kindergarten teacher...haha. Kindergarten teacher writes him up, his mom comes in, they have a disciplinary hearing, kid gets expelled...they have to move out to a new neighborhood. It's all part of the masterplan.
Couldn't help myself. Bought six donuts for $2. That is my breakfast + a croissant and clam chowder soup.
We are assuming too much. What if the kid is Jewish? Obviously no Santa. Could tell him there is no god but he could be Atheist. Threaten to sell him on the black market if he says it again. Child Labor doesn't care what religion you are.