Well in this case I think the reason he said that is because Trump said he didn't pay any federal taxes. Or at least inferred it. @phillyk didn't just make that up, it came from the racist horses mouth.
Naw! You ain't dense! Golfers have been trying to figure that out since golf was invented. Some of them do, and they go on to become very good golfers. Many of them don't, and they go on to become like the rest of us. Stuck in the crap!