The next time someone says, "If you didn't vote, you can't complain."

To me, that is just about as UN-American as the saying, "America, Love it or Leave It".

Bill of Rights, Amendment One: Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

Nowhere does any American document say that if you don't vote, you lose your freedom of speech.
Nowhere does any American document say that if you don't vote, you lose your right to protest.
Nowhere does any American document say that if you don't vote, you're not an American.

But saying, "If you don't vote, you can't complain." DOES say that.