>>127332875Started with the hillbillies and their moonshine, that they sold out of mason jars. Then hipsters started picking up on the habit. At around that time Mark Harmon used them on a popular show to show how down to earth his character was.
At that point it just snowballed down the quirk home decorating fads till every house wife in America started using mason jars in place of like 70% of their dishes.