How can I tell my friend who is full blooded mexican not be "faking japanese" how do I handle this annoyance?

My family’s mom last name is Miyagi and my moms fullblooded and she even thinks my friends kinda weird…What should I do to teach her a lesson ,look I already tried to speak to her in japanese and she ignored it and everyone still thinks shes japanese. please help me I want my old mexican friend back…

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