The workforce at Metro, at least in Automatic Train Control (ATC), is rather diverse. Overall, that is a good thing but it can cause problems.
A former coworker of mine wanted to confirm the details of a work assignment so he asked his supervisor. In the course of their conversation my coworker referred to the old expression, “Straight from the horse’s mouth”. The supervisor flew into a rage and accused him of calling him a horse and insisted that this was a grievous insult! My coworker tried to explain that “Straight from the horse’s mouth” was a commonly used expression and that absolutely no disrespect was intended, but the supervisor wasn’t convinced. He told my coworker that if he ever used that expression again he would write him up.
Cultural differences. They can trip you up sometimes.