As a fellow immigrant working in the US and as someone working with non native speakers from other regions in the world, I can assure you this is not about racism. It is about team cohesion, clarity, getting things done in an international team. People have to spend extra brain cycles just to tune in to how you say things, before they can focus on what you actually say. This is especially true at the beginning of working with someone who's accent you have never heard. There is a big difference in accents between someone from India, France, Ukraine. While there is nothing wrong with that, it has value for international teams to mitigate this difference and settle on a common standard.