Meanwhile, in a full third of all the countries in the world, homosexuality is still illegal (sometimes punishable by death), and the majority of the world population still thinks homosexuality is wrong. There's about twenty in the world that are more friendly to "queerness" than the US[0] -- mostly monoethnic white countries with a couple of exceptions.
You may also be surprised by how socially conservative nonwhite people in this country are in general; even less than a decade ago, the majority of black Americans did not support gay marriage[1].
[0]: https://academic.oup.com/eurpub/article/28/5/967/4919666
[1]: https://www.pewresearch.org/short-reads/2014/10/07/blacks-ar...
Blue states don't have a great history on those other issues, either. Oregon literally prohibited black people from entering its territory. The last Major League Baseball team to integrate was the Red Sox. A quarter of all present-day blue states have never elected a black person to the House of Representatives, and another quarter have only ever elected one.
Actually, even today, most professional athletes point to Boston as the most racist city they'll play in. "Sanctuary cities" in blue states like Chicago and NYC are pushing refugees out to the comparatively redder suburbs right now. In the meantime, college-educated black people are moving back to the South.
Point being, differences are only felt in the extreme margins; red states and blue states are just the difference of 49% vs. 51% one direction or another on almost every divisive issue.