That’s my point though. Get out is a film about racism. 3 billboards isn’t.Get Out addressed it's racism. Three Billboards presented it as tangential characteristics of the town/characters but didn't have anything to actually say about it. Which is cool, I guess, but having nothing to say about the issue you're using as a setting, while still using stock black prop characters in your narrative with huge tonal shifts makes it feel clumsy.
It merely presents it as one characters trait. It’s like saying a film can’t have a character be an alcoholic unless it’s a deep dive of a film all about alcoholism. Having a character be racist isn’t something that suddenly means the film should morph into a film about racism.