Ree-hee-hee-ally? California is far and away the #1 destination of educated and wealthy domestic migrants, especially from "red states", by which I assume you mean states that habitually vote for Republicans. Pick any MAGA-infested den of ignorance that you prefer, and the story is the same. I choose Sioux Falls, SD, which has an overall negative net domestic migration that is extremely negative among people with some college, college degrees, and post-graduate educations but positive among people with high school diplomas and high-school dropouts. Bay Area domestic migration is the complement of this process: very positive among post-graduates and college grads, very negative among high school and less.

Same basic story if you break it down by income levels.

Why is this? There are large classes of people who can't stand to live in the MAGAsphere, and I mean huge classes of people like females, people of color, homosexuals, and non-christians. Whenever these people scrape together enough money to do so, they escape to a jurisdiction that recognizes their personhood, whether that be New York, California, or Austin.