What Part of (Insert whatever) Do You Not Understand?

I’m confused. It used to be whenever the phrase, “What part of whatever do you not understand?” was used it was rather clear that what was not understood was simple. For example, “What part of ‘No” do you not understand?” The word “No” was simple and difficult to misunderstand. However, lately on TV I see the phrase used for all sorts of things; some of which might be misunderstood. This need to stop.

​Here are some ways that phrase might be used that I never want to see:
What part of brain surgery do you not understand?
What part of rocket science do you not understand?
What part of nuclear physics do you not understand?
What part of calculus do you not understand?
What part of French do you not understand?
What part of time travel do you not understand?
What part of the time-space continuum do you not understand?
What part of the String theory do you not understand?
What part of the #Trump White House do you not understand?
What part of the #Big-Bang theory do you not understand?

Okay? Finally, what part of this blog do you not understand?
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