I live in nyc today and whenever I hear people say that , it turns out they mean “New York City is the greatest city in the world of New York City and Waterloo, Wisconsin.”
And even then , I’ve seen photos of Waterloo… looks like the air is nice and breathable there. And apparently you can afford to rent a place on a normal salary.
You don’t have to agree but at least try and get out of your bubble. You don’t even know enough different people in New York City itself to support that claim, apparently.
Here's an easy test. Think of the city you currently live in. Ask people where you live if they think this city you're living in is better than New York. They'll have a lot to say about it.
If you ask people in New York if the place you live is better than New York they'll say "Huh, where is that?"