You'll need to be more specific. They have really nice ones Levallois, Neuilly, Versailles. And not so nice ones: St. Denis, aubervillier. If you take the train from CDG to Paris than you only see the bad. The train from Orly to Paris has lots of nice areas. Anything by La Defense and Versailles has as sizable expat population, ie. $£€, so they are well off.
Just like New York's South Bronx doesn't surround the city. The bad suburbs don't surround Paris.