look down one's nose at
look down one's nose at {v. phr.}, {informal}
To think of as worthless; feel scorn for.
The banker's wife has beautiful china cups, and she looked down her nose at the plastic cups that Mrs. Brown used.
Harry has never had to work, and he looks down his nose at people in business.
Jerry was the athlete who looked down his nose at the weak student.
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Source: A Dictionary of American Idioms