Dinklage's take strikes me as asinine. It's as daft as the aforementioned claim that orcs are just stand-ins for black people. The dwarves of mythology – which are rooted in Norse religion, by the way – aren't identical with growth-restricted humans, nor are they generally seen as such by the media-consuming public. No one who's ever watched Lord of the Rings has pointed at Dinklage and went "Look, it's one of them!" By the way; I can't remember ever watching the Disney adaption, but the original dwarves of the Brothers' Grimm are generally portrayed in a positive light.