Red dress, blue dress.

Getting ready for a posh dinner party: Your wife comes down the stairs wearing a red dress and asks if you like it - you agree in the affirmative. Then why does she say "what's wrong with the blue dress?". To which you reply "I love you in your blue dress. To which she retorts "but you just said you like me in the red dress". So you reply "I do, and I also like you in the blue dress, you look great in either". She replies "you are just saying that". You say "no, darling, look, put on the blue dress if it makes you happier. She then storms off to put on the blue dress. She returns to ask if you think this is better. And you say "yes" and she screams "I knew it, you did not like the red dress all along and I loved it...you bastard!"
Discuss...