The teacher and student weren't identified, and district officials said he wasn't disciplined. Amanda Fulkerson, district communications officer, called the incident a personnel matter.
Several students, parents, teachers and one school board member backed the teacher at a Thursday meeting.
"This teacher has my support," said Clark County school Trustee Linda Young, the only black and minority school board member. Young noted that she didn't receive complaints from the public, and said she believed the teacher meant no harm.
Esther Langston, a University of Nevada, Las Vegas, professor emeritus with the Delta Sigma Theta black sorority and educational organization, said the teacher needed the academic freedom to educate students in a creative fashion.
Clark County School District equity and diversity chief Greta Peay told The Sun teachers must prepare carefully before and after a potentially controversial lesson to avoid misunderstandings.
Peay said she understood that the purpose of the controversial lessons was to have students better empathize with the victims during the Jim Crow era and the Holocaust. However, Peay said she would not personally recommend that teachers allow their students to dress up as controversial historical characters.