If you tried hand playing with a rat who has never done it, they can see it as aggression from you. They get confused and think you are trying to dominate them. I had that happen to me. When Fettucine turned and lunged at my hand, he sunk is sharp teeth so deep that it bled for most of the day. And they can hold a grudge too.
I would recommend not trying to interact with him for a while, let him come to you at his own pace. Give him some space and time as he is clearly telling you he's not ready for tickles and playing. Adult rats don't always want to play with humans.
I would recommend not trying to interact with him for a while, let him come to you at his own pace. Give him some space and time as he is clearly telling you he's not ready for tickles and playing. Adult rats don't always want to play with humans.