I didn't mean that at all. It is not ok ever to drive while reading. Not only are both hands holding up the book (at least in this woman's case) rather than focused on the act of steering, your eyes are diverted from the road as is a great deal of your attention. Talking on a cell phone requires only one hand (or less if on hands-free mode), doesn't divert one's eyes, and occupies no more of one's attention than a conversation with someone in the car.
As for the golf comparison, I'm not sure it fits. Driving a car, when it comes down to the actual motions used is pretty simple by comparison. Perhaps, that's why most people can somewhat competently drive a car but so few can drive a golf ball well (even with two hands).