Love that chart. It clearly had to be a joke and not have any validity to it.
I have to agree with Peter that in Florida alone, most of the heavily populated cities are loaded with Yankees transplants.
Then take NJ as another example. Northern Jersey is comprised primarily of Mets and Yankees fans. Central and Southern Jersey is split with NY and PA teams.
In Florida, heck if you can easily get a ticket for a training game in Tampa.
That said, I can understand the hate.
It is sort of like the Bulls, the Patriots, the A's and so many others that are proven winners repeatedly. After a while, jealousy is masked via hatred.
In the end, I am glad I have been on the Yankees side since 1966.
I have lived the painful years and have enjoyed many great ones.