Learn what "you don't understand what you're talking about" means, when people say it, and how to use it naturally in English.

It means the speaker thinks the other person is wrong or uninformed and says it in a confrontational way.
From One Night, One Forever, Episode 52
The speaker dismisses the other person's opinion as uninformed.
Use this in an argument when you want to reject someone's opinion very directly. It can sound rude or insulting, so it is not good for polite work conversations.
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