Patrick isn't even from Chicago, he's from Arlington Heights. Speakling as a Chicago suburbanite myself (Lisle Illinois, motherfuckers!), I know it might seem a lot simpler to tell people you're from Chicago, but it's a bald-faced lie. Most of the people who say they're from Chicago aren't, really. The Chicagoland area is like 80% suburbs.
I think it's easier and also the topics he brings up as "being from Chicago" aren't strictly restricted to Chicago. I actually live near Arlington Heights and of course nobody will know the name of a suburb in Illinois so you just say Chicago. I'm glad I don't live in Chicago to be fair.