The term barbarian was originally used by the Ancient Greeks, as a descriptive word to apply to anyone whose first language wasn't Greek. Originally it had no pejorative meaning associated with it, being merely a descriptive word. The Romans adopted the word to refer to anyone who wasn't Roman.

Modern usage has turned the word into a pejorative to refer to people less cultured than oneself.

Since the Ancient Greeks would have meant the Ancient Greek language, not Modern Greek, by the original definition everyone in the world today is a barbarian.