Learn what "who do you think you are" means, when people say it, and how to use it naturally in English.

This is a confrontational way to ask who someone thinks they are acting like.
From Help! I’m Falling In Love With My Rude CEO, Episode 4
Someone insults another person's status or attitude in a confrontation.
Use it in an argument when challenging someone's behavior or attitude. It is rude and can sound very aggressive.
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