Blacking up is offensive becuse it was done out of racism to keep black people out of film. Also, makeup wasn't done in a realistic way. Instead, it was done to make a mockery of black people.. painting white people up like racist cartoons of black people. It was intended to be a slap in the face to blacks, so, of course it was offensive.
Cripping up, as you've called it, is only offensive if it's done in an offensive way, IMO. When it's tastefully done by a talented actor, it's a nice tribute to disabled people IMO. There are MANY films over the decades where actors have portrayed disabled people in very realistic believable heartwarming ways. Further, there simply aren't that many disabled actors to cast in these roles. No sense in having a cut rate actor simply because they have a particular diagnosis when you can have the best actor for the role (and marketability to sell the film) who is fully capable of acting the part. Those who are offended are the type to get offended by virtually anything.
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for supporting trump. Because doing so is deplorable.