As much as i agree anime is Japanese made, anime sites have decided to allow Chinese and Korean anime for whatever reason. Which is unfair to avatar.
I think avatar shouldve just been grandfathered into the anime community. I believe most anime lovers would agree it is definitely an american made anime. Is that a slippery slope to other american shows being grouped in? I think not, because there are no other beloved american animes other than avatar.
You must not have finished readding his comment, in the last paragraph dude is recommending hentia with good action and story.