What's a Critique of RWBY That You Don't Agree With?

For me, one that I've heard that I think is just super nitpicky is claiming RWBY is just copying Avatar by calling it's seasons "Volumes", since Avatar calls their seasons "Books". This just feels like a nitpick because Avatar isn't exactly unique in this. For example Code Geass calls their episodes "Turns", Planetes calls their episodes "Phases", and Cowboy Bebop calls their episodes "Sessions".

Sure those are episodes not seasons, but still. I feel it's nitpicky to say RWBY'S ripping off Avatar for that.