I have had 2 major accent related events in my life and both were in a training environment.
When I went back to school I had to take some writing classes as my style was more cookbook and chemistry than anything. I wound up in a class with a very loud Spanish lady who rolled r's and had a rapid fire delivery that I just could not follow. Had to drop that class.
The second one was a class on bi- directional networks for automotive applications. It was one of the first systems ( Chrysler CCD systems ) and training that had been offered to the aftermarket ( non dealer techs).
The presenter was basically Gomer Pyle.
Lanky stooped good ole boy that sounded like possum stew. This trainer was the most educated guy I ever met for electronics. Rather than an impediment to understanding his speech taught me to listen and process IN THE MOMENT which is something I tend to not do in training as I like to write outlines of lectures and self study. This gentleman has also been fighting the entire industry because of a simple idea he had for wiring diagrams. He thought the class a way to color code a wiring diagram to show the expected information that a tool would provide during normal operation. Circuits were colored for power, ground, switch to power, switch to ground, low voltage signal and on and on. I used his idea when I began my teaching career in 98.