You remind him of one of his least favorite people. He left the crew not so long before you signed on, so you can't blame the little fellow for being a bit confused. I'm sure as long as you treat him right and don't threaten to eat him, he'll warm up to you soon enough.

[He scratches under the parrot's chin, which seems to calm the bird down a little more.]

Whenever Sakamoto chooses to stop drinking himself into oblivion, he'll probably be confused for the same reasons. [The same reasons being "you look and sound like Gintoki and Sakamoto has the IQ of a parrot.]