But this USED to be common ettoquette: one does NOT speak a foreign language, nor whisper, as it at least COULD BE intended to hide something. Anything from mocking someone, to making nefarious plans.
There is a story about this, from the Civil War I believe, of prisoners on a train under guard, Speaking a language such as German or Italian (Swiss connection), about how they’d make an escape etc. The guard knew the language so they were put under special wraps.
Yes, it is common courtesy. But society in the US has become so low class, it’s not surprising, much less the catering to illegals.
Mod Note: As the PA moderator I accidentally altered this post but then fixed it. My bad.