Fursternino and Mikado nailed it. And it also explains the shift in other moderate to socially liberal suburban areas outside of New England.
Candidate Trump came off as moderate (though abrasive). President Trump was a (fake) right-winger through and through. Didn't matter that his conservative views were fake when he was appointing extremists to the courts. Also, I'd add that he did an even more incompetent job than people probably expected. Many of these people probably thought he was a clown but assumed he'd just let smart people actually govern. Covid handling made clear that wasn't the case.
I hate this so much. It infrutited me back in 2016 when people said Trump was a moderate who would make deals. And that Hillary was a republican
But it must be nice to white and prilvaged