Response to Blackface in Japan

Most responsible and culturally aware expats, immigrants or migrants make an effort to develop awareness of the cultural sensitivities of the people of their host country. However, there are times when the people of a host country overlook or may not be sensitive to the cultural disturbances they cause to people who aren't native to their nation. 

Japanese variety shows have a recorded past of having their entertainers perform in blackface. Foreign nationals in Japan have raised their concerns about this in the Japanese media over the years and it appears that their voices are being flat out ignored.

What do you think is the best way to handle situations when a host country displays a lack of sensitivity to the cultures of their overseas guests or residents?