You old cynic, well that make two of us.
cynic
noun
1 a person who believes that people are motivated purely by self-interest. a sceptic.
2 (Cynic) a member of a school of ancient Greek philosophers characterized by an ostentatious contempt for wealth and pleasure.
DERIVATIVES
cynicism noun
ORIGIN
C16: from Latin cynicus, from Greek kunikos; probably originally from Kunosarges, the name of a gymnasium where Antisthenes (the founder of the school of philosophy) taught, but popularly taken to mean 'doglike, churlish', kuon, kun-, 'dog' becoming a nickname for a Cynic.