When a customer service worker tries to chit chat or make some sort of small talk with you, so long as you have the emotional bandwidth for it, then at least respond to their efforts to chit chat or make small talk instead of ignoring them completely.
Sure, plenty of customer service workers have low emotional bandwidth themselves and are happy to ignore and be ignored in return. However, if someone is trying to chat with you about the weather or whatever, it's nice to at least reply to their attempts. This is because many customer service workers feel dehumanized by being constantly ignored and brushed off by customers all day. Smiling and saying "hi" to someone only to be completely ignored all day every day does tend to get to many people.
So when you board the bus during a wind storm and the bus driver makes a joke about the "beautiful weather we're having today", instead of ignoring her it's nice to just make a simple "haha yeah sure is!" back to her. When the receptionist says something about the never-ending construction going on in the building, it's nice to say something back like "haha yeah they sure are taking their time" instead of brushing him off entirely. These might be small interactions, but it could make a huge difference to them and how humanized they feel at work.
