It's genetic. Robert McNeil, in his book on the English language, noticed that the English have the same opinion of people from east Anglia, i.e. Norfolk and Suffolk, and generally the area from The Wash down to the Thames, in easternmost England. That is the source area for many of the Massachusetts Bay colonists, and they and New Englanders have many cultural traits in common, all deplored by the mass of civilized humanity.
You will notice, too, that colonial history was marked by several moves by English settlers to distance themselves, i.e. literally to secede, from those persistently unpleasant people in Massachusetts.
Genetic? You mean you are a racist?
Maybe you've noticed that that part of Britain has been the most Conservative section of the country in the 20th century.