Obviously those discriminations are illegal so it goes passive most of the times, by continuous interruption during meetings or intentionally asked to repeat or elaborate themselves, among other.
It’s not about communication abilities as this is usually the covert passive response for such discriminatory behaviors, a lot of these candidates can speak “better” in terms of clarity than people with Australian accent for example, it’s just another episode of “I’m better than you”, you can read more about that in here:
https://www.bbc.com/worklife/article/20210528-the-pervasive-...
https://www.forbes.com/sites/janicegassam/2022/11/18/accent-...
https://exceptionalindividuals.com/about-us/blog/what-is-dys...