In my culture I can find people both straight and curly hair on every social level (and although I can't say for sure there is no hair texture to status correlation, I am not aware of any prejudices with respect to this), but it never occured to me that I could be ignorant about whether my friend has straight or curly hair. Maybe I use "friend" too restrictively.
You might be ignorant about whether some of your friends have naturally curly or straight hair.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.