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How to analyse language

Harper Lee introduces humour into the trial scene when Bob Ewell is being questioned by both Atticus and his own lawyer and he fails to understand the true meaning of the word :

Mr Gilmer asked him one more question. “About your writing with your left hand, are you ambidextrous, Mr. Ewell?” “I most positively am not, I can use one hand good as the other. One hand good as the other,” he added, glaring at the defence table.

Question

How does the language in this quotation tell us something about Bob Ewell as well as provide some humour?