At Reed College, a small liberal-arts school in Portland, Oregon, a 39-year-old Saturday Night Live skit recently caused an uproar over cultural appropriation. In the classic Steve Martin skit, he performs a goofy song, “King Tut,” meant to satirize a Tutankhamun exhibit touring the U.S. and to criticize the commercialization of Egyptian culture. You could say that his critique is weak; that his humor is lame; that his dance moves are unintentionally offensive or downright racist. All of that, and more, was debated in a humanities course at Reed.But many students found the video so egregious that they opposed its...