Question

How does Mowgli feel in this part of the story?

What is the cause of his feelings?
"Listen, you!" Mowgli cried. "There is no need for this
dog's jabber. Ye have told me so often tonight that I am a
man (though indeed I would have been a wolf with you to
my life's end) that I feel your words are true. So I do not
call ye my brothers any more, but sag [dogs), as a man
should."
—“Mowgli's Brothers," The Jungle Book,
Rudyard Kipling
HELP MEE

Answer 1

Most likely anger. "Listen, you!" is not a friendly remark. "So I do not call ye my brothers anymore," also isn't that friendly. I don't know the whole context of why he was saying that, but just reading those few lines I can tell he is most likely filled with hatred against someone/a select few.

Answer 2

The first one is "upset" and the second one is "He can no longer call the wolves his family."

correct on edg 2021