What does the description of Bob Ewell taking the stand, reveal about his behavior on the stand, and reveal about him?

When Bob Ewell takes the stand he is unpleasant and insensitive of others. Through his behavior, he shows himself to be a rude, prejudice, and angry man.

Text evidence:

“Are you the father of Mayella Ewell?” was the next question.
“Well, if I ain’t I can’t do nothing about it now, her ma’s dead,” was the answer.

“Well, Mayella was raisin‘ this holy racket so I dropped m’load and run as fast as I could but I run into th’ fence, but when I got distangled I run up to th‘ window and I seen—” Mr. Ewell’s face grew scarlet. He stood up and pointed his finger at Tom Robinson. “—I seen that black nigger yonder ruttin’ on my Mayella!”

The witness said he never thought of it, he had never called a doctor to any of his’n in his life, and if he had it would have cost him five dollars. “That all?” he asked.