Deniro's character from the wrong era
OK, Deniro plays a 70-year-old guy who, as it is noted in the film, graduated from college in 1965, just two years before the summer of love, four years before Woodstock and with many youthful years left to explore hard rock, drugs and the sexual revolution.
But he acts like a member of the "greatest generation," with his extremely dated attitudes, his "handkerchief" *beep* and his swing-band-era/WWII-canteen-dance chivalry. So is this what the writers think happens when you get "old?" You suddenly start acting like someone from your father's generation?
That's just one of the reasons why this movie is some seriously insulting garbage.