I don't understand, don't get upset I'm not with you...

from Daft Punk (Ft. Julian Casablancas) – Instant Crush Lyrics on Rap Genius

Meaning

The object of the singer’s affections is obviously of the point-of-view that he just doesn’t ‘get it’, and her attempt to reason with him has turned to anger. The singer tries to assuage her irritation.

To clarify, “I’m not with you” means “Don’t get upset — I’m not (upset) with you”

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