This is very true, but it reminds me of the time my friends and I climbed into a taxi while on vacation about 25 years ago. We are all American-born but speak conversational Chinese. One girl said in Chinese, "I hope the taxi driver doesn't drive the long way and run the meter up."
The driver (a Black man) turned around and replied in very good Chinese, "Don't worry, young miss, I would never do that!"
We all squealed in shock that he spoke Chinese. Then we spent the rest of the drive talking with him about how he learned to speak Chinese so well.
Has that happened to you? I don't think Dutch is common in the U.S., but I also didn't think Chinese was that common with non-Chinese people in the U.S. (at least not 25 years ago!).