I think it must have been more of a big thing in the South. I grew up in Michigan around the same time period and don't recall ever hearing of or witnessing a single white person in the circles I used to hang out with dressing up in blackface.https://twitter.com/LeonardPittsJr1/status/1093562953960431616 …
Possibly, but I spent my teen years in a Detroit suburb that is now MAGA country. I saw plenty of racism there growing up. I was sensitive to it because I'd spent the first 10+ years of my childhood growing up in northwest Detroit and was a bit more sensitive to it.