After posting a controversial photo to Instagram in which she was kitted out like a stereotypical White male private-school student, the first Black female student body president of an elite institution stepped down from her post.

In the photo, Maya Peterson—now a Lawrenceville School grad—sports a Yale hoodie and button-up and holds a hockey stick. The caption joked that she was dressed as a “Lawrenceville boi” and featured the hashtags “#romney2016,” “#confederate,” and “#peakedinhighschool.”

Peterson said she posted the snap in response to the backlash she received for her senior photo, in which she and friends posed using a “Black Power” salute. In an interview with Buzzfeed, she said the “boi” photo was a joke, but apparently some of her classmates didn’t see it that way. Neither did the school.