People who don’t like golf are smarter than those who like it; therefore, John can be confident that his audience will figure it out. What John faces here is a perception problem.
Technical jargon and insider vocabulary are irrelevant to individuals who are ignorant of them. He should have practiced his presentation using a more educational approach.
John could try to instill in his audience a passion for golf similar to his own by demonstrating his exceptional swing. He used to be a dynamite salesman, and he can sell golf carts to non-golfers any day.
John should remember to use copious hand motions as he speaks, so that his point will come across loud and clear. This will cut through any body language barriers that may be present.