You went to a grocery store where the cashiers are often rude to you. You can't believe that they're so rude. You say this while complaining to a friend about the store employees.
They don't even make eye contact with you!
Use "They don't ___" for things that people often don't do, or things that they never do. The word "even" shows that you think something is basic. In the example the speaker thinks that making eye contact is a basic level of politeness that all store employees should follow. She can't believe that the employees act this way.
"Making eye contact" with someone means looking at their eyes while they look back at you. When two people look at each other's eyes for a long time, you say that they're "staring at" each other. But when they look at each other for just a moment, it's called "making eye contact". In the United States, it's polite for people to smile and make eye contact with people who they deal with. You should make eye contact with a customer, someone you've just met, someone you see on the street who you recognize from your work, and so on.
The word "you" is used in English to talk about people in general. In the example above, the word "you" doesn't just mean the person who the speaker is talking to. It means all the customers at that store. Here's another example:
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