I know first hand Niles are not really mean by nature but very aggresive towards anything and everybody.
Do not take it as your animal hates you but more of a defensive behavior.
Just be very cautious around your Niles,and dont expect he-or-she to come and snuggle up to you any time soon!
Unless you got some super thick gloves and are willing to get scratched to holy hell or a nice frisky chomp!
He-or-she just dont know how good they got it.
Dont give up either on your animal for not being as personnal as you want it to be.
It is what it is and you cant hate the animal for doing its natural thing.
Just giving some friendly advice for you,thats all!

Your Savannah looks to be healthy and happy.
Those guys are great and have a personality to match.