Learn what "i don't know what is wrong with you" means, when people say it, and how to use it naturally in English.

It means the speaker is upset and cannot understand the other person's behavior.
From The Missing Piece, Episode 4
Someone bluntly tells another person they do not understand their behavior.
Use this in an argument when expressing frustration, but it can sound rude or insulting. It is common in conflict, not in polite conversation.
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