If you really want to be an ally, reading nonfiction about race in America isn't enough. Black fiction should make your list, too.
Literary fiction might be more empathy-generating than genre books.
It's not a vacation without a tote full of books!
The contempt these mystery readers sometimes feel directed at them gets recycled as they express disdain for books they don't like which have been written and enjoyed by people they have to denigrate. That's not an argument or even a defense: it's blatant insecurity.