look down your nose at something
look down (one's) nose at (someone or something)
To regard oneself as superior to others and thus act in a haughty or snobbish manner. The well-dressed businessman looked down his nose at the homeless man sitting on the corner. Once Jane was promoted to management, she looked down her nose at the people who used to be her colleagues.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
look down your nose at somethingINFORMAL
COMMON If someone looks down their nose at a thing or person, they regard that thing or person as inferior and treat them with disrespect. I get the impression they look down their noses at people who are not dressed in expensive labels. I thought he'd look down his nose at pop music. Note: You use this expression to show that you disapprove of this attitude.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012