This article argues that segregation is prevalent in Houston.
https://www.houstonchronicle.com/local/gray-matters/article/...
https://www.houstonchronicle.com/local/gray-matters/article/...
But look up San Francisco's racial makeup vs Houston's and... you can make the case that there's at least a place in the same city for a lot more people in Houston.
They're practically the same if you swap the black and asian populations. This makes a lot of sense: Asian immigrant populations came from the west coast, usually SF. Black populations started in the southeast, and its much easier to migrate from Mississippi to Texas than Mississippi to San Francisco.