Mickey's Mellerdrammer is a short film released by Disney in 1933. The premise is that of Mickey and friends putting on a stage production of Harriet Beecher Stowe's famous anti-slavery novel Uncle Tom's Cabin.
In the production, Mickey plays Uncle Tom. Mickey was dressed in blackface: Exaggerated orange lips, bushy sidewhiskers made out of cotton, and his now-famous white gloves.
This film, along with other films released by Disney, led to the belief that Walt Disney himself was racist. However, most Disney scholars agree that Disney was not racist, but rather racially insensitive, as many people from his time were.
In either case, now you know where Mickey got his white gloves. The cartoon was probably not controversial at the time, but the perception changed as time passed and people's attitudes towards racial insensitivity changed.
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