The Predator has been around since 1987. With several movies, novels, and comics, canon or not. There is no mystifying them anymore. They're hunters, they have tribes, codes of honor, they look different, and we've seen females. And they're home planet, and their subspecies rivals. Two members of the same species talking to one another takes absolutely nothing away.
Infact I would actually LOVE to see two Predators communicating and coordinating during a hunt. Like actually see it as it's happening, not off screen.