New York City is not only the most populous city in the USA, not only has the most sights, or the most single people. Not only do New York have more Italians than Venice, more Irish than Dublin, and more Jews than anywhere else in the world.
New York is the most democratic city on the planet. No one is usually surprised. However, there are things in the Big Apple that you shouldn’t do, and if you ignore the recommendations, you will annoy others.