Then those people really are ignorant, because Wharton IS an Ivy League school:
"The Wharton School of the University of Pennsylvania (also known as the Wharton School, the Wharton School of Business, or simply Wharton) is the business school of the University of Pennsylvania, a private Ivy League university located in Philadelphia." (Wikipedia)
Yah, and it regularly scores in the top three or top five best business schools — but Trump still gets laughed at for it. Go figure.