People have plenty of REAL PROBLEMS/ISSUES to deal with, a piggy bank is one of life's most inconsequential issues. If someone is petty enough to get offended by a piggy bank, s/he has misplaced priorities. The problem with this sort of people, they are never wrong (ie, in their mind, they are just and righteous) and no point wasting your precious time to prove them otherwise.
My two cents.