In my life experience so far it seems that most of these unintelligent remarks I've heard are blanket statements, sweeping generalizations such as the wealthy are not happy or that their wealth was stolen or "earned" from illegal or unethical activities. Another offensive and untrue generalization that I have heard people say is that a wealthy person's money was inherited, or given to them as if it were not even possible to be self made, even when it is clear that the (now) wealthy person came from a poor or disadvantaged background!
Two more unintelligent remarks about wealthy people I've have heard from those who are poor & middle class people are the generalizations that they do drugs or are misers. It is also not uncommon for people who are not wealthy to say that wealthy people are snobby/elitist, have too much money, think they're better than other people. I believe that some wealthy people may be snobby/elitist but many are not, I do not believe that a person can have "too much money" because this is an individual's goal, personal choice, inheritance, gift, or a combination of these things. No individual or group should be able to decide how much money another person has or does not have.
Lastly, many of those who say that someone "thinks they are better than..." are pots calling the kettle black and are actually angry or jealous that they aren't wealthy themselves. Those making these types of statements sometimes ignore proof to the contrary of the generalizations they make. Even when I was a child I understood that the hatred that is so often directed at the wealthy has a tendency to be misdirected anger and/or jealousy. As an adult I can honestly say all that I've seen & experience supports this theory and that I have yet to see evidence to the contrary.