Jokes about sex with 12 year olds aren’t funny missy!!

I had last night off and got to go have some fun for a little while.  I met up with some of my friends at some bar.  They were watching the game.  Sports.  I really could not give a shit about them, so I showed up after the whole thing was over and everyone was very depressed because of the losing.  As we were leaving we stopped out front to smoke cigarettes.  This girl showed up out of nowhere and just took over the conversation.  That was fine, who doesn’t like meeting new people? 

My problem is she preceeded to tell some dumb sexist jokes like "What is the difference between a girl who spits and one who swallows?…30 pounds of pressure!"  I don’t think my friends thought it was that funny but they all kind of laughed.  i think out of pity.  But i just stood there, and wanted to slap this girl and tell her to shut up.  But she didn’t stop.  No, there was a joke about "banging" a 12 year old girl.  And she actually said "I’m a girl I can get away with saying I’m having sex with a 12 year old girl."  I was just thinking ‘wow, i hope you are wasted because you sound like a fucking moron.’

Now i wish i had said some shit to her, but i am not a confrontational person, and i don’t want to be a huge bitch because i don’t think my point will get across if she thinks i’m an asshole.  so i need some jokes about sexism being lame that i can say in those situtations.  anyone got any?