Pardon my late arrival, AlphaFrog.
The dwarf/LP groups can decide which movies they want to protest and which battles they want to fight. As with any other minority group, they do not have to pick every battle and they do not have to care what battles WE think they should choose.
As for the the blackface comparison, I can see some similarities since these are roles designed for dwarfs/LP. Not to mention the concept of dwarfs/LP having mainstream acting roles without being labeled as "the short person". Other than that, every group wants their struggle to be comparable to a more easily identified struggle. Stop piggy backing, dwarfs/LP groups. Get your own.