What part of the usage of the “What part of ____ do you not understand” do you not understand?

Here are four times when “What part of X did you not understand?” doesn’t work as an argument:

When your listener wasn’t around when you said X.
When you haven’t actually ever said X.
When X is, in fact, quite confusing.
When X is, in fact, not true.

Did I miss any?

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