This is actually one of the best maps on here in a while. If you know the US discourse, you can clearly read the stereotypes, political bubbles and straight-up ignorance of the various different people that were surveyed.
Illinois gets dinged because of racist narrative around Chicago. Montana does better than the rest of the midwest because it's romaticised. The people who hate California are a different bunch than the ones who hate Illinois or, for the most part, Alabama. NJ is mainly known from jokes at their expense by media-powerhouse New York. Few people know enough about South Dakota to care. DC just absorbs opinions of the feds.
I don't get the love-on for North Carolina and Pennsylvania, I guess.