Poor little dog

Rico says, courtesy of his friend Rich Shaner, this splendid joke (which Rico thought was going to have a different ending entirely):

The train was quite crowded, and a US Marine walked the entire length looking for a seat, but the only one left was taken by the poodle of well-dressed, middle-aged French woman.
The war-weary Marine asked, "Ma'am, may I have that seat?"
The French woman just sniffed and said, to no one in particular "Americans are so rude. My little Fifi is using that seat."
The Marine walked the entire train again, but the only seat left was under that dog. "Please, ma'am. May I sit down? I'm very tired..."
She snorted, "Not only are you Americans rude, you are also arrogant!"
This time the Marine didn't say a word; he just picked up the dog, tossed it out the train window, and sat down.
The woman shrieked, "Someone must defend my honour! This American needs to be put in his place!"
An English gentleman sitting nearby spoke up, "Sir, you Americans seem to have a penchant for doing the wrong thing. You hold the fork in the wrong hand. You drive your cars on the wrong side of the road. And now, sir, you seem to have thrown the wrong bitch out the window."