The cantina is a metaphor. The world is the cantina. You have what? five? different alien races a couple of miles down the road in the Caves of Chaos alone. Everyone knows aliens exist, and live a few miles down the road. That's not humancentric. Humancentric is when the Caves of Chaos are full of human bandits. Humancentric is when over the course of several sessions the players may gradually learn of the existence of aliens, but no one believes them.
Y'know, this is a point. And probably why everyone tends to talk past each other. When
@Paul Farquhar talks about humanocentric, he seems to be referencings settings like Hyboria. Yes, there are non-humans in the setting, but, they are very, very few and far between. There are entire Conan stories where no non-humans appear. By this definition, something like John Carter, Warlord of Mars would not be humanocentric, simply because the only human in the stories is John Carter.
OTOH,
@Zardnaar is referring to the protagonists. It's humanocentric, so long as the protagonists are human (or at least mostly human). So, Warlord of Mars becomes Humanocentric in this definition because John Carter is the protagonist. A campaign is humanocentric, regardless of the broader setting, so long as the PC's are (mostly) human.
Makes for an interesting comparison really. Is Star Wars Humanocentric? How about Lord of the Rings? According to
@Zardnaar's definition, LotR and most certainly The Hobbit is very much not humanocentric. There are almost no human characters at all. OTOH, according to
@Paul Farquhar, the setting of Middle Earth is pretty solidly humanocentric. Other than a few conclaves of non-humans, nearly everyone in Middle Earth is human. Or, take the two views of Greyhawk. Because of the1e rules, most groups tended to be heavily weighted towards humans. But, the setting certainly skew that way - there are tons of non-humans all over the place. Since we're not playing by 1e rules anymore, I'm not sure if that skewing really applies.
It might be more useful to be a bit more specific in what you mean by humanocentric. Because, at it stands, the two of you are just talking past each other.