What does Garfield mean when he says, "I'll never ask Jon why he walked into the pet store that day"?

This sentence comes from the American cartoon "Cat and Dog Wars", and Garfield is one of the protagonists. This sentence is actually the reason why Garfield doesn't want to ask Jon why he walked into the pet store. This sentence mainly expresses Garfield's indifference and unwillingness to understand this problem. This may be because Garfield is lazy and selfish, and doesn't care about other people's behavior. Therefore, he chose not to ask Jon why he walked into the pet shop, and he would not explore the significance of this question.