“Redneck - supporters of the National Covenant of 1638 declared that Scotland embraced democratic church governance and rejected the Church of England. Some signed in blood and wore a red kerchief around their necks”
This may have historical veracity, but I think the use of the word, “redneck” comes from the red bananas miners used in the coal mines of Appalachia.
The problem with the miner’s etymology is that it refers to declarations of union loyalty by miners in the early 20th century while the use of “redneck” for working class southerners far predates that period.