Since this thread has fully developed, I've got some language stories, and even a moral at the end.
About 18 years ago we hired a new receptionist. She was a "Hawtie", as in very nice looking, nice to be around, and put together pretty darn well. It turned out she was french-American. Her mother met her father while he was stationed there in the 1960s. She was raised with her mother speaking both languages. Even when she was in high school, she was amused at the corruption of her mothers language by the teachers. Then time passed and she didn't practice it at all.
Finally, she had an aunt pass away and she had to go with her mother back to bury the one and see the survivors. She was uncomfortable so she just spoke English to her mother who translated. Near the end of her 2 week stay they were visiting someone and the anti-American BS got too deep for her. At one particularly offensive tirade, much of it directed at her personally, he just snapped and responded at what she reported as very good french (never capitalized, or at least until they start winning.) Only then did the rest of them understand she'd been hearing what they'd been saying all along. The conclusion is all french people aren't particularly polite, nor do they like Americans. Her mother said she was proud of her for being able to hold her tongue so long.
Story 2: The grandson of the owner of my current employer came to work here. That was in early 2000, and he'd spent about 10 years in Panama and Honduras. He managed a banana plantation. Because he worked with natives 14 or more hours a day, he became fluent in Spanish and the dialects of the region. He even married a girl from there.
When he came back, he needed a job and we hired him. We became friends because he was a gun nut, and about the only intelligent person I had to speak with around here. But the company was in one of its ruts, hiring illegals. I was told to forget the entire thing, that they were "checked out." I'm sure, since 3 of them had consecutive SS numbers, with only the last digit changed! Yeah, that happens.
Anyway, he just listened to their conversations. They chattered away, just assuming no one could understand either their words or their slang. Wrong. Most were sent away quickly. Those who remained got some kind of paperwork completed.
What it comes down to is our experiences with foreigners here is pretty spotty. Many are resentful of their hosts (us). They're also hold us in contempt for our stupidity. At the same time they like the money, so most are careful of how they act.
Me, I can't even understand Eubonics. Nor do I want to.