I am also in Wisconsin. It depends a lot on who you hang around with. Most of the people I have met are nice. I have indeed found nasty people, but they are everywhere.
I do have to agree with the "fattest in America" remark. Most people here are overweight. I guess it is a combination of long winters, sausages, cheese and bear. Not a good thing is you actually want to be in shape.
I also agree that people in Wisconsin are not necessarilly the "friendliest" people in the US. People in the South are a lot warmer and forthcoming. However, you can still socialize and make friends.
Have you ever considered hanging out with foreigners? They would not have this Republican mentality and will not be baised towards a specific unfriendly behavior. They will behave as they behave in their country. Just a thought...
As for San Diego, great climate, more expensive than Wisconsin, and better looking women. I have familty there and they love it.
Bye,
Knight Tickler