It makes no sense to respond to this with a chart of median income. That tells you nothing about how many well-off people there are beyond limiting it to less than 50%, presuming the median is below whatever threshold you consider.

Here's a table of states with median, top 20%, and top 5% figures: https://beforeview.com/income-percentile/state

Mississippi, the lowest one on the list, has a top 5% at over $200,000/year. That's ~150,000 people in households who can comfortably afford a nice new EV, in just one small, poor state.

The states defined by the Census Bureau as being in "the midwest" (a subset of "flyover states") contain about 70 million people. The top 5% would be 3.5 million people who can afford a nice new EV. And this is conservative: someone in the top 6% can probably afford one too, but I'm not counting them, and there's plenty of "flyover state" territory beyond the midwest.

California is big enough and rich enough to have a huge amount of market power. But it's not so big and rich that it makes 100+ million Americans in the middle of the country completely irrelevant and ignorable.