School is, ideally, a place where you are supposed to go to learn stuff.
While the students' treatment of Darnell is inexcusable, anyone who comes to school in drag on a day that isn't Halloween is asking for trouble and drawing all kinds of negative attention to himself. This kid needs to start exercising some common sense BEFORE any sort of violence happens, in order to de-escalate the situation.
(Note that most schools also have some sort of dress code, and I'm not sure if this kid is violating his)