An ass on purpose.

Why is it that some Jeopardy contestants deliberately sound bored? "WHAT is a toucan?" they'll ask, stressing the first word and looking as if they are insulted by the simplicity of the question. Don't they know that makes people hate them? We as viewers look at a person we never saw or will never meet, and form an opinion as to whether or not we like them. So very unscientific, but I can't help thinking that such a passing impression would probably hold true in actual life. After all, who wants to be friends with a pompous ass?