Of the very small handful of third-class passengers who survived, only a few were ever asked to talk about the sinking at length. So there would be little contemporary material for one to conduct research off. Plus, James Cameron is human, and if he did deliberately misrepresent or omit the narratives of certain groups of people out of maliciousness, then he deserves to be condemned; but I think it is more likely he simply overlooked certain details or took creative license. After all, the movie's end goal was to entertain.
I personally think that much like the WSL's and the public's general opinion of steerage at the time, any omission by James Cameron vis-à-vis the third-class passengers was not because the steerage passengers mattered less, only that they were simply overlooked. Furthermore, Europe and North America were still very much white-people-centric societies at the time, and I doubt few people would have bothered to record the experiences of non-whites at the time. Add that to the already lacking material on third-class, and you have virtually no information on 'coloured' steerage passengers on which to base research.
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