The establishment of the day looked at Jackson much like today’s establishment looks at Trump.
(JQ Adams) had plans for, among other projects, a national university and saw government as the duty and calling of educated and enlightened men. He despised the kind of partisan politics that had come into being around the figure of Jackson, who would be running again in 1828.
So JQA was then what is killing the nation now: an elitist who believed the “educated and enlightened” should make government a career. Something of a dichotomy when placed with the second observation that he despised partisan politics.