In this case, since the slurs were a aimed at a white UK reporter by an unhinged white woman, it was jingoism.

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Racism is asserting an inferiority or superiority based on natural race; passively or aggressively.

You can’t just use it any time you see two cultures or societies giving each other shit about their politics, foods, social customs, etc. The context of genealogy needs to be included, i.e. race. Jokes about British teeth are much closer to racism than what dumb-dumb said.