Why is orange hair called red hair?

because the term "orange head," is not as catchy as "red head." A lot of terms today are attributed to how catchy they are. Ex. Ronald McDonald

OR because there is a difference between "Orange" and "red". There are some people who have auburn hair that looks brownish, and there are some people who have coppery colored hair. And there are some who's hair looks straight up orange. I have red hair, and I hated it when people said my hair was "orange" - especially since mine was dark red. I found it rude. If people want to be that way, then I can just start calling all the blonds Yellow-heads.