I saw this sentence in the OpenRussian corpus of examples:
Пробле́ма в том, что Вы - не кана́дец.
кана́дец be in the genitive case (
не кана́дца?) due to negation?
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This "- канадец" ("not" or not "not" is not important here) is definition of Subject here. It's the Nominative Case (and it's answering for the question "Who (is)?" ). As they said, you are confusing phrases "не канадец" and "нет канадца"
The function of Genetive Case is a show of origin or possessive one, but in the grammar meaning, not just semantic. https://www.ruspeach.com/learning/14657/
If you said smth like "He haven't got the Canadian citizenship" - here the adjective would in Genetive C. "Он не имеет канадскОГО гражданствА"... this G.C. here is for the "citizenship", and adjective would about this (the object "citizenship", not the subject "He"), and in this Case.
If you are wished to say smth in G.C. about this situation, it's maybe smth like this "Не Канада породила его, не канадского такого его" :) "Из него не вышло канадца", "Из него не выйдет канадца". But this will be the other style of sentence and this may have other non-neutral connotations... :> And the other meaning really, such a negative prediction or negative affirmation about result of the process when he really tryed to make himself as Canadian. :>