Hong Kong people may not treat people speaking minority lang or look like minority as part of hong kong people, and this is a sense of exclusion simply from the different language they speak or different way they look.

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Hong Kong people might regard them as different identities based on different contexts, for instance, when they are in some tourist spots, they might think they are tourists.

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In this case, this might hinder the language maintenance as they do not want to be discriminated , they want to look like and act like part of the Hong Kong people.