Cultural appropriation is a liberal term that describes disrespect for ethnic groups. The issue is championed by Social justice warriors, the perpetually offended takes issue with individuals and groups perceived by them as intolerant of multiculturalism. For example, Taco Tuesday lunch menu is disrespecting Hispanics. Dreadlocks on a white person is disrespecting black people. An Indian Halloween costume is disrespecting of Native Americans.
Cultural appropriation is the logical extension of Marxist ideology, the division and balkanization of people along race, religion, wealth, gender and in the modern era- sexuality.