Betsy DeVos gave the commencement speech at Bethune-Cookman University in Florida and received an unfriendly reception from the graduates. Many booed and were chastised by the University President. Many stood with their backs to the speaker. It was probably not the best venue for a billionaire who works for the Trump administration, which has appealed to white males and the alt-right, no friends of African Americans.
I did not have time to watch her speech but I believe the link includes the video. I assume she spoke about school choice, the only subject in the world of education that interests her.