This concept has nothing to do with discrimination based on ethnic differences or nationality. It has to do with basic communication skills that are essential to do the job. If it's a question of improving your knowledge of the local language, then take courses until you're fluent and easy to understand not just enough to get by. You exaggerate Don't exaggerate to tell customers what they want to hear. This is called lying.
Customers hate that.
You're indiscreet 'Indiscreet' describes the cashier at a self-serve gas station who chatted with his friends while I entered to pay. He barely stopped his conversation with his buddies to take my money. I felt like I was crashing a private party. I never went back. While this obvious display of rudeness is relatively rare, a much more common example is when employees converse amongst themselves in front of the customer.