Not every life is worth the same, but Sparrow Pupil believes he's worthless when he's not. I haven't even known him that long, and I can see that clearly. He's a human believing he's worth as much as a monkey.

[ He turns to look at Tanjiro. His gaze is strangely distant. ]

He didn't understand your meaning, so he took it the wrong way. He compares himself to the people he knows are important to you, and then, he fails to see a place for himself among them.