Although >>1791 already covered the main points, I would like to add something.
Regular people are naturally distrustful of the elite, especially the economic elite. This stems from two factors.
First, individuals think of themselves in a positive way, i.e. they see themselves as honest, hardworking, ethical, etc. When they look at their current situation and see that they are not as successful as they wish, they have a tendency to shift blame. Add to that the constant corruption scandals that show up on the news and the average person soon starts believing that those who are rich have become so through illegitimate means (because they are honest and hardworking and can't get rich, so the rich guys must be rich because they are dishonest and leach on others!). This establishes the notion, either consciously or subconsciously, that rich people abide by a different moral code than the rest of us, one that allows and encourages them to take advantage of those less powerful.
The second factor is the perception of how rich people enjoy themselves. The elite is shown to have a tendency to seek our exclusive and exotic means of entertainment, which is likely due to the social expectation. It would also make sense to assume that much like pleasure junkies, the rich need to constantly seek out more exclusive and exotic entertainment to satisfy their desires, because mundane things like regular monogamous sex just don't cut it anymore.
Put those two together and with a minimal nudge the audience will believe that the rich are engaged in practices such as pedophilia, cannibalism, sadistic games and so on.
Basically, make use of your audience's already present internal image of the elite and make it so that they reach the conclusions you want them to reach in an almost autonomous way. If they don't have that internal image, help them develop one by making use of the natural psychological tendencies in humans, such as envy and distrust of outsiders of your group (such as social class).