Is it normal for my corn to only accept food in his enclosure?

He's 4 years old now and a really shy snake never even once hissed or tried to strike at me, so I don't think it'll ever become an issue just wanted to know if this happens to anyone else.

I tried taking him out of his cage to feed him but he rejected it which he's never done before in his enclosure. Then I put him back in his cage and offered again and he struck it immediately.