How did this guy get through life only having read one book in his whole life?
The same way most Democrats do. By putting their heads in the sand and pretending that they already know everything worth knowing.
I make no comment about the particular actor who made this comment. But I will say this about many in the Entertainment business: they don't read. They are profoundly ignorant. But ... they are So-Much-Smarter-Than-You-And-You-Should-Just-Shut-Up-And-Drink-In-Their-Wisdom.
Barbara Streisand and Richard Gere fall into this category.