As usual, it is impossible to comment on a particular case without any context.
If the person making these comments is the principal, given the way you feel about it, you should switch schools. Proper Chinuch can not happen if the parents and the school do not get along.
If the person is the secretary, you can complain to the administration, but that most likely will get you nowhere, so just grin and bear it. Use the opportunity to teach your children how to be a Savlan.