"Le vrai New-Yorkais croit secrètement que les gens vivant ailleurs doivent, en quelque sorte, plaisanter."

Simplified Meaning:

People who live in New York City love it so much that they find it hard to believe anyone would want to live anywhere else. For example, imagine someone who grew up in a small town and then moved to New York City. They might find the city's energy, opportunities, and attractions so amazing that they can't imagine giving it up for life in a quieter, less exciting place. This is similar to a sports fan who thinks their favorite team is the best and can't understand why anyone would cheer for another team. New Yorkers feel proud of their city, and this pride makes them see other places as less appealing. If you live in New York, you see its diversity and excitement every day, so places without those features might seem boring or less interesting to you. This way of thinking can also be useful in life because it shows the importance of being passionate about where you live or what you do, and it encourages people to see the value in their own experiences. However, it's also a reminder to appreciate that other people might find happiness in different ways and places.