You could think about folding on that flop. Even if he doesnt have a straight or set it is very easy for him to have 2 pair on this board.
When he raises the turn again it is even more likely he has better than AA.

That final A does change it. It cuts out alot of the hands that beat you, but it also means any K has a straight.

With no read it isnt unreasonable to start thinking of a fold on the flop, and folding after the turn raise is fine.

With a maniac read id struggle to fold that flop but id still want a cheap showdown. Its a very nice flop to bluff so if hes a thinking maniac (if such a thing exists) then it might be better to play it harder.