That's not necessarily money's fault, and I'd point out that there are certainly rich people that don't fall into this category.
People who want to pursue happiness need the freedom to do so. Freedom to pursue happiness can be directly correlated with how much money, or wealth, is available to the person.
It's not money's fault that some people don't know how to be truly happy. Money simply affords freedom.
The problem is that with enough freedom and no idea how to be happy in it, you're going to end up in a worse place than if you didn't have the money in the first place.
Money doesn't automatically make people smug and funless (new word?). People make people smug and funless (when they have the freedom and inclination to (unintentionally(?)) do so).