Sounds like a great book. Nearly all of my friends are White, as I like to be around other White people. It’s nice to be understood without constant questions. I’m an adult and I live in a very White area. For younger White people that live in more liberal places, full of people that don’t understand them or are actively hostile, stories of healthy White community can give those people hope for a better life. These things are extremely important to a lot of young White people and even as an adult I prefer stories that have realistic White representation for people like me - which means everyone is some kind of White.

It sounds like the story just wasn’t for you but it strikes me as totally realistic to have a book with primarily or only White characters. These people congregate in groups because they understand each other better.