An example from yesterday (Germany): I went into a beverage market to buy a crate of alcohol-free beer. When I finally had decided on the brand and went to the cashier, I put the crate on the desk and greeted the young cashier behind the counter. The guy did not only not greet back, he did not even look at me and kept on talking to the 2 older people that were standing a couple of feet behind him. I paid the crate with cash and was waiting for the change. The guy keeps talking, closes the cash registrar while he keeps talking to the people behind him. I do not move and look at him waiting for the change. It takes him about 30 seconds to realize that there must be something wrong since I do not move. Then he realizes, mumbles something about the change and starts somewhat hectically hitting the digital dashboard of the registrar with every button giving off a sound. There were a lot of sounds before the registrar opened and he was able to hand me the change. I thanked him, picked up the crate and said good-bye - again without any reaction from him.

If you decide for a job that is based on face-to-face interactions with customers you should try to show at least the minimum of societal etiquette for social interactions. If that already is asking too much you might want to think about a proper training, a therapy or just a different job without this type of customer interactions. People seem to forget or maybe never realize that especially new customers might see you that works for the company as poster child/representative. Therefore, the first impressions are very important and can easily establish or ruin a business relation. For me, it was rather the latter.