Bad manners

Chewing with your mouth open, or talking with food in your mouth, the sounds are insufferable.
 
Not saying "thank you", "sorry", and "excuse me". It's actually pretty simple, but it could tell a lot about a person if they rarely used those three words in social situation.
 
Not saying "good morning/afternoon" to someone when you know them. But anyway, most people don't do that anymore.
 
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