ps, I think you may have edited while I was posting, so as to the question of should it be addressed more formally, or taught...If there are classes or instruction that set up examples that teachers or students would really run into, I think could be a very effective approach.

ex:
While standing in front of the parents asking if you are going to provide such and such (enrichment, other) folder of material for their child, if you are NOT/never going to provide that folder, just say so "No, we won't ever give your child the things you are requesting."