How does Jason giving Simon a ride in his Ferrari so that they can get a part for their broken car show the contrast between Jason and his sister, Diane?

The fact that Jason drives a Ferrari, which is a very expensive car, and Simon has to buy parts to fix his car seems to contrast the twin's different circumstances. It seems that Simon (who is Diane's boyfriend) is going to have to fix his car himself and it is likely an older car since it has broken down. Jason, on the other hand, probably would just drop his Ferrari off at a dealer if there was any mechanical issue. This contrast reveals the level of wealth that the two live at and that it is disparate.