It is common to respond to a person who is exhorting us to change our behavior by drawing attention to that person' s own behavior  This response, however, is irrational
Whether or not someone in fact heeds his or her own advice is irrelevant to whether that person' s advice should be heeded
One should not dismiss the philosopher's argument that matter does not exist by pointing out that the philosopher acts as though matter exists. People's actions have no effect on the strength of their arguments.