Education Secretary Betsy DeVos faced students booing and turning their backs on her during a commencement address at Bethune-Cookman University in Daytona Beach.

At one point, B-CU President Edison Jackson, who has defended his invitation to DeVos to speak to graduates at the historically black university, warned students to be more respectful.

“If this behavior continues, your degrees will be mailed to you. Choose which way you want to go,” Jackson told the crowd.

During Wednesday’s graduation ceremonies for B-CU’s Class of 2017, DeVos faced shouts of “Liar!” and “Just go” while trying to speak.

“Let’s choose to hear one another out,” DeVos said, reading her prepared text in a measured tone despite continuing of boos, catcalls and scattered applauseAs the crowd.

DeVos alienated many African-Americans in February when she described historically black colleges as “real pioneers when it comes to school choice.” After a storm of criticism, she acknowledged that these colleges were “born, not out of mere choice, but out of necessity, in the face of racism.”