Is it rude for a person from another country to be anti-social in English and friendly in their language?

Let’s say they’ve lived in America for 25 years or so, and understand English perfectly, but doesn’t speak it as well. Should they learn to be anti-social in English and their initial language evenly, in the event that they can’t grasp the English language? I mean, for them to switch from “mute” to a chatterbox... show more Let’s say they’ve lived in America for 25 years or so, and understand English perfectly, but doesn’t speak it as well. Should they learn to be anti-social in English and their initial language evenly, in the event that they can’t grasp the English language? I mean, for them to switch from “mute” to a chatterbox at the blink of an eye, seems like they’re anxious to talk about an English person behind their back, thus the following:

*English person walks by* Non-English: Oh hi. Bye.
*Person who speaks their language, walks by* Non-English: [So excited to see that person; starts flapping gums in their language]

Is it rude to selective about who you’re outgoing with?
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