[buggyone]

First such a person assumes that a closed minded person never explored other points of view.
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That is exactly right. One who has never explored other points of view is certainly closed minded. If the person has explored other points of view and is still of their original viewpoint, they are not closed minded since they have looked at both sides.

Regarding the gay and lesbian example, if a person has fairly looked at the civil rights issue, they cannot deny that gays and lesbians should have the same rights as all people. You can certainly disagree with that lifestyle but it is bigoted not to say they should not have the same civil rights as anyone else.

On a political level, a closed minded person is one who says they would never, under any circumstances, vote for a (woman, person of color, Democrat, Republican, Catholic, Mormon, etc). Explore all issues and vote accordingly.