What does “it's a free country” mean?

used as a reply when sb suggests that you should not do sth

How is “it's a free country” used?

In Clue (1985), one line is: “- I see. - It's a free country. Don't you know that?”

The clip at the top of this page is from Clue (1985).

- I see. - It's a free country. Don't you know that?

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