That is insulting....but mostly just ignorant, as in, ignorance. The term "Red Necks" was derived from individuals wearing a red handkerchief during the ... well...here:

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This dramatic and often overlooked chapter in American history took place when miners stood up and fought coal operators for their constitutional rights, fair labor practices, and the right to join a union. The roughly 10,000 justice-seeking miners who took up arms and marched to battle in 1921 at the climax of the mine wars wore red bandannas around their necks and came to be known as “the Red Neck Army.” So when you call someone a redneck in West Virginia, you may be giving them a compliment.

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ref: http://www.yesmagazine.org/new-economy/is-wes...-mine-wars

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The miners were diverse: native-born whites from the nearby hollows, African Americans who’d come up from the deep south, and immigrants from places like Hungary and Italy who spoke little English. Despite their differences, they formed a union. They demanded fair pay, safer working conditions, an end to the mine guard system, and the right to organize. Coal companies countered by hiring more guards to harass and threaten the striking miners, and violence erupted.

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So I am assuming you are anti-union?