Nicki Minaj’s hairdresser, Terrence Davidson, defended her and warned haters from choosing sides in the “American Idol” spat between Minaj and Mariah Carey. He posted on Facebook: “Stop hitting me about what happened . . . if you wasn’t there save your speech.” Davidson told us: “People began flooding my page with their negative opinions and nasty thoughts without having access to the full story. Everyone has an opinion, but I don’t like it when people make assumptions and rude comments.”