I'll be 74-years old this week. I have seen "Black Face," evolve from a foot in the door in movies for Black Vaudevillians, to solidarity with black performers by people like Bing Crosby. I worked with a former Procter and Gamble P.R. Rep who "passively integrated" early TV, by suggesting that "street scenes," have some black "extras," in them. TV Variety Shows often featured "Medicine Show," segments with stars in Black Face. It was seen as "safe integration," at a time of pressure on all segments of society to de-segregate.
My Mother was half-Penobscot, but I don't look "native." I have had the advantage of fitting in within the majority population. I have never felt racially hyper-sensitive. So, I share your "if it's not hurting someone else," sense of things. It appears that a significant number of Black people do feel negatively about "Blackface." My Grandma stressed "Be Polite at all times," as an important social norm. I try to be polite and avoid promoting something that needlessly hurts others.
A stereotype that grates on me is the "Fat, Dumb, Racist Southernor." I have spent a lot of time in the Southern US, mostly in Georgia and Florida. I'm not saying that they don't exist, but I never met this stereotype. It does great harm to perpetuate this as a model for cops. I'm not saying there aren't racist cops. We have seen some egregious examples recently. But most of the cops I have met joined the force to make things safe for Grandmas, kids and otherwise vulnerable people. This unpopular stereotype only makes that job harder. I'll put the soap box away, for now.