Listless: having or showing little or no interest in anything; languid; spiritless; indifferent
Maybe rabid, frenzied, populist even irrationally loyal. But certainly not listless. No one is saying "(sigh) well, I guess I'll vote for Trump if I'm not getting my earwax rotated on election day."
Trump supporters are about as "listless" as the Beatlemaniacs of the mid-sixties. In October, 2020, huge crowds lined the streets of Newport Beach, Calif. to see Trump's limousine go by (I was there). This was not a parade; Trump was in the Southland to visit a friend. Yet tens of thousands showed up just to see him go by. This sort of thing happens with rock stars, but never politicians.
Using one his last moments in the spotlight to insult Trump supporters. Goodbye, Ron.