Trump is rude and likes to insult people. He makes a point of emphasizing that he lacks “Derech eretz” (which perhaps is an act, as he seems to relish being the character he developed for his TV show, which may or may not be what he is really like).
His ideology is well within the mainstream of American politics (he’s somewhat to the left of the Republicans, similar more to Rockefeller, Eisenhower or Theodore Roosevelt). His style and manners are well beyond what is expected of a public figure.