I'm sure Texas is great if you are a white, cishet, conservative man! I'm not so sure it's great if you aren't all those things.
Seattle definitely has a history of redlining and race exclusion. It's also farther from the U.S. south, where population densities of non white folk historically lived. That city is almost certainly alienating to non white folks from a "few people here look like me" perspective.
But Texas has a higher rate of incarceration for Black folks, per 100,000 Black folks than Washington. I don't know that I'd call the state a great place to live, even if lots of people call it home. A high population of any one group does not mean that the state is a good place for those people. Or that those people will have cultural acceptance. Using your examples, Oregon and Washington and Texas all have about 50% women, but Oregon and Washington are much less likely to remove access to women's healthcare.
As a non white person that has lived in both Seattle and Texas: I am not suggesting, it I am affirming it. It’s weird to talk with people like you who are so wrapped up in identity politics yet you can’t see the appeal of being in an area where you aren’t the only one of your kind.
Stay in another state that’s more… culturally enriched.
I happen to think Stephenson was dead wrong, and his example of composite culture was a strawman, and I’m not the only person who does.
Or, you know, they could just be racist.