The impersonal in other cultures is not disrespectful (obviously,) but rather as a sign of respect to that person whom you're not familiar with.
After all, we here in the states wouldn't address an elderly man we've never met by saying, "Hey, dude!" We'd say, "Hello, Sir." I know this example is kind of silly, and is based more on age, but it's really the same idea.
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trux
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