A man and his son are walking down the street. The man tips his hat in greeting to a passing woman. The son asks "Why did you tip your hat to her? She's no lady

A man and his son are walking down the street. The man tips his hat in greeting to a passing woman. The son asks "Why did you tip your hat to her? She's no lady!" The man replies "You're right she's no lady. But I am a gentleman."