This morning he was darkly prepared to find something wrong, and he felt belittled when the mixture exploded sweet and strong, and the car didn’t even brush the door-jamb, gouged and splintery with many bruisings by fenders, as he backed out of the garage.
There are no more uses of "belittle" in the book.
Show samples from other sources
The gradualness of the change does not belittle its importance.
He needs to learn to disagree without belittling his opponent.