Why do Americans who blindly support the two-party system feel the need to scorn and insult people who vote 3rd party?

Anonymous
I mean, whoever people in the US vote for, is no one else's business but apparently, Americans like to dictate other Americans on how their should exercise their freedoms to vote. If someone does not vote at all, Americans bitch and moan about they have no right to complain about the government. If someone does actually vote but it's neither a Democrat or Republican, Americans still bitch and moan regardless.

Americans wonder why their political system is a laughing stock of the Western World.
Why do Americans who blindly support the two-party system feel the need to scorn and insult people who vote 3rd party?
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