No, you don't generally call a PERSON a "half breed" except as part of an insult. And it's an insult that comes from a time when "race-mixing" was so despised that it was a crime in some states. Here's a pretty common example of how "half breed" is typically used, from "Tom Sawyer":<quoted text>Since he is a half breed, the whole arguement hinges on how it is said, as a matter of fact or with denigration.
"Say, Huck, I know another o' them voices; it's Injun Joe."
"That's sothat murderin' halfbreed! I'd druther they was devils a dern sight."
And remember this 70s song "Half Breed" from Cher?
"My father married a pure Cherokee
My mother's people were ashamed of me
The Indians said that I was white by law
The white man always called me "Indian Squaw"
Half-breed, that's all I ever heard
Half-breed, how I learned to hate the word
Half-breed, "She's no good," they warned.
Both sides were against me since the day I was born"
These days the term is mostly used by closet racists referring to Obama.