English phrase from drama scenes

What Does "you don't know what you're doing" Mean?

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

Beginner
Rude
Firm
Confront

You don't know what you're doing.

The speaker is directly saying the other person is incompetent or making poor decisions.

From Good For Him, Episode 29

When do people say this?

Scene Context

Someone insults another person by saying they are incompetent.

Usage Scenario

Use this in an argument or to criticize someone's actions, but it is rude and confrontational. It is common in heated conflict.

Better ways to say it

1
You don't know what you're doing.
2
You have no idea what you're doing.
3
You don't know what you're doing, do you?

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