“Put them on notice”? “American company”? What century is this?

There are innumerable businesses in the USA where groups of people speak different languages together. I routinely speak Spanish with people in stores, car repair places, farms etc and most of them seem to be US citizens simply more comfortable in Spanish than English. Why shouldn’t US citizens use the language they want? (BTW I come from a country where I’d be shocked if even 1% had ever overheard a sentence in Spanish).

Years ago I worked at a research lab in Texas where some of the scientists would discuss things together in Spanish unless someone who didn’t speak it was in the room. Nobody seemed at all perturbed by this. Before that I worked at a government research lab in France where it was not uncommon to have stretches of discussion in English when discussing, say, a research paper in that language. Why not?