When I was 16 years old, I was an exchange student to Germany for a year. I’m American. One of the classes I was taking was English literature. It was early on in the school year, I didn’t know many people. The class was reading the Grapes of Wrath. The teacher was a non-native English speaker but spoke British English. One day we took turns reading from the book aloud. After I read, the teacher said, ‘Too bad you butchered it with your American accent’. It was Steinbeck! But at the time I didn’t stick up for myself.
I had to raise an issue with higher management in a big multinational because they said we couldn’t speak any language other than English while on shift (illegal) and that we would lose bonuses or get fired if we did (highly illegal). They even dared to put it in writing and send an email stating ALL of it. Of course, they had to back down. But out of a team of 50-60 people (90% foreigners), nobody else was brave enough to complain. Not even foreign managers.