Garden variety rudeness is not what I’m concerned about. Loss of basic civility is.
Your co-workers behavior may be rudeness or it may not. Have you ever lived outside your country for an extended period. What language do you guess you’d be talking to your fellow Americans in under those circumstances? I’ve found myself in this situation many times, among English Speakers and among French speakers. I can tell you that you will (despite your best efforts) tend to switch to your native tongue again and again. It is just hard-wired in your brain.
There is a difference between friends/family communicating in another language and snobbery. It really irritates me to enter an area where English is being spoken and people start to speak in a different. IMO, in public the language of choice should be what the majority speaks, if possible.
You want to see rude go to Chinatown and be anything but Chinese.
Even my Filipino freind gets the cold shoulder when trying to shop there.
I would say your view is tainted by being in France. When I was in the Air Force I was stationed overseas quite a bit (mostly in Germany). Me and my friends always tried our best to speak the native language off base. Not only did this let us get some fluency in the language we got a much better reception from the locals when we tried to speak their language. I mention this because this worked in Germany, Italy, and Spain. But not in France, my experience in France is that the locals would rather you speak a foreign language than “Pretend” as it was described to me, to speak French.
Not into my brain, it isn't. Despite your claim to the "reasonable view", you seem to have issues.
Perhaps there is food for thought for you there, if you wish to see it.
Have you ever lived outside your country for an extended period.”
You’re a legal citizen of the USA,but consider yourself on an extended leave of absence from Mexico and you want dual citizenship because when you become an American (USA) citizen you can’t buy property in Mexico.