Quebecers have a good second sense of whether to address a stranger in English or French. The gas station attendant walk out, looks at dad behind the wheel, assesses (correctly) that he is not an native English speaker, and speak to him in French.
My father was a more recent immigrant to America and his English was proportionately poorer. He turns to my mother, curses in Italian and adds, “I didn’t know there is another language in this country! I’m having a hard enough time learning English!”
My mother gently pointed out they were not in the U.S. and indeed, in Canada they also speak French – to his great relief.