Silly question, I know. I was under the impression that "red tea" is another name for Rooibos (a tisane), while black tea is black tea. Lately, I've seen people using "red tea" and "black tea" interchangeably and saying things like "red, aka black tea." Does this have something to do with maybe what something is called in the area where they live, or are they wrong, or am I wrong?