Neither would I, in the balance it was a decent summary. That's why I submitted it, as a longtime customer of Gore Vidal's writings (I can stop anytime, really *).
But yes, there was some "unnecessary roughness" to the piece, perhaps the author wanted to assert intellectual independence.
That would go down better if he understood that there have been aristocrats who were political populists for all of recorded history, most notably a certain Caius Julius Caesar who started out with the bluest blood and thinnest purse in Rome.
(* besides I've run out of new material, having a while ago snarfed the Edgar Box mysteries, 1950s potboilers where Vidal just had to portray power-adjacent milieus.)