I think a lot of what he says makes sense, but I think I know why the truck salesman was trying to upsell him. This guy is rich. He talks about having a Ferrari. If he recently went to buy a Ford truck, he probably pulled up to the dealership driving a nice car. The salesman would have seen that and figured that he should sell him a pricey truck. He probably also figured that this guy was not looking to just buy any old truck. Most rich dudes would want the high end ones, and would be fine waiting to get the right model.
Obviously that doesn't excuse not listening to the customer. But it gives a sense of why he might have been focusing on getting this guy just the right truck, not just trying to sell him the one red one they had.