I don't see what the problem is. She's Latina. She feels she needs to speak English and also that other Spanish speakers should speak in English while living in the USA.
I know a guy who gets pissed when his son is in public and tries to speak Spanish. Of course, I think "then why the fuck did you teach him Spanish?" But Anyway, it's ok for her because she speaks Spanish.
If it was some white redneck lady telling him to "speak English because we're in Texas" it would be a whole different story.
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