I'm not aware of any such distinction in the law.

The more significant legal concept would be https://en.wikipedia.org/wiki/Protected_group, I'd imagine. "Far right" isn't on the list. (Neither is far left, incidentally.)

I don't know of a de jure distinction either, but clearly there is a de facto distinction. Perhaps the law is undefined on this subject?

Is Alex Jones far right? From what I've seen he's insane (intergalactic pedophiles etc) and right wing, but not inciting race war or anything you'd expect from US far right groups. Maybe I'm wrong and he does, I've just never seen it.