The main thing what I always found repulsive about Avatar, is its message, which says, it's A-OK to throw away your humanity and completely betray your own species. I am not sure if it was intentional, a precursor of progressive lunacy, or just a colossal fuck up of the "white man falls in love with savage princess" trope. The trope only works, if the protagonist realizes the difference between him and the savages is purely superficial and ideological, everyone involved is human, so fighting is just a pointless waste of life. But in Avatar the savages are weird, alien, cat prople and humans can only interact with them, if they become creepy skinwalkers. Humanity is also on the verge of extinction, to survive, they need that unobtainium (real subtle James). Jake Sully's task is to find a peaceful way to obtain it, but he does fuck all to achieve this goal. He just falls in love with the blue chick, turns on humanity on a dime, essentially dooming it and IIRC manages to transfer his mind into his artificial na'vi body, killing his human self.
It promotes the dystopian nightmare the elites wish to achieve. You should inherently feel bad for existing, you should force yourself to live in a pod and escape into an artificial happy place, where you can be anything, but yourself. If you still cannot cope with your filthy existence, the state gladly euthonazis you. All this, to protect the holy environment.