It isn’t uncommon for Black people or POC to have straight natural hair. It isn’t rare either, it’s quite common. Straight hair isn’t only exclusive to white people. However,
I agree with this statement. People (majority of the time it is non-POC or non-Black people) that like to point out how white people have “afro-textured” hair or as @/YourMom pointed out they like to show examples “Napoleon Dynamite” who has a very obvious different texture that is nowhere close to being afro-textured. We don’t have that many hairstyles and when we do get hairstyles- people like to fight us on who can wear this and how it doesn’t belong to just one group, which is very frustrating.
It might be annoying to see a lot of Black authors go hard for these hairstyles and features, but it is more annoying to see a lot of ignorant comments about these features.