Because they are from New York and 50% of the people there have no clue how to argue constructively, besides name calling....Us people from Chicago know how to argue constructively, which is why Chicago RULES...
(only 4 images allowed, otherwise, I was going to go nuts with smileys)
(For the record, I am totally kidding about this, but we haven't had a Chicago vs NY battle in SOME TIME, YANKEES SUCK)