" Ad hominem: An abbreviation for argumentum ad hominem, meaning an argument against an idea or statement based on the character of the person who authored it. It is sometimes used to discredit a philosophy of life proclaimed by someone who does not live up to it himself, as in, “He talks the talk, but he doesn’t walk the walk, so I’m not listening to his advice. "

― Daniel Klein , Every Time I Find the Meaning of Life, They Change It: Wisdom of the Great Philosophers on How to Live