Why do some women say one thing but mean the total opposite?

How come some women will say one thing but mean the complete opposite. Or they'll say something and you agree with them and you get in trouble?

i.e

Her: That actress in that movie is really pretty

You: Yea she is

Her: She's not that pretty! I'm prettier!

Her: I feel fat

You: Yea you are

Her: You're so mean! I can't believe you

(okay that one I know better but still)

Her: I'm tired of walking, my feet hurt

You: Yea, let me give you a piggy back ride

Her: NO!

Why do some women say one thing but mean the total opposite?
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