Exploring bias and stereotypes, students dress up as members of "outgroups" (groups of people who are often judged). Though the lesson specifies that it should be "respectful and not mock the outgroup in any way," this activity would be difficult  for even the most mature teenager to pull off. The intention is good, as other students observe how the costumed student is treated by others, but the same result could come from real-life observation or even just a group discussion.