A large part it probably stems from the fact that a number of people today, from all age groups, but primarily millenials dislike talking about racism. This isn't to say they endorse it, but that it makes them uncomfortable. Acknowledging that racism still exists today is difficult to accept for a lot of people. Especially people who don't generally experience racism and/or discrimination i.e. white males.
It is somewhat understandable. Racism is an unsavory topic that is very emotionally charged. But the only way to end it is by talking about and coming to grips with the fact that racism didn't end with passage of the Civil Rights Act.