look down on
look down on also look down upon {v.}
To think of (a person or thing) as less good or important; feel that (someone) is not as good as you are, or that (something) is not worth having or doing; consider inferior.
Mary looked down on her classmates because she was better dressed than they were.
Jack looked down on Al for his poor manners.
Miss Tracy likes tennis but she looks down on football as too rough.
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Source: A Dictionary of American Idioms
