This is a statement to stress a point, but it is in the form of a question, to which an answer is not expected.

Example:
A. Why am I so stupid?
B. Well, there are no easy answers!
A. Oh shut up! That was a rhetorical question.

Other examples:
Why are some people so mean?
Why does it have to rain so much?
What’s the matter with the economy?

Compare to:
Figure of speech.

This idiom or expression has to do with:

Raising a question at random to get some ideas.
Asking a general question just to see what the mood is like.

This idiom or expression has to do with:

Bringing attention to something.

Also:
Raising an issue.
Raising a question.

This idiom or expression-like question means:

Not liking (or accepting) someone or something.

When someone says: Do you have a problem with that? they mean: Don’t you like it?

Note:
Depending on the way it is said, this simple question may sound like a threat!

This idiom or expression like phrase represents:

A question that:

Could lead to other questions.
Doesn’t have a yes-or-no answer.
Can get you in trouble when you answer it.

This idiom or expression like phrase means:

The main question.
An important question or issue.

When someone says “The economy is the $64,000 question,” they mean something like “It’s how we handle the economy that we should be talking about.”

Other numbers have been used also: The million dollar question, etc.