Another WTF are you thinking ploppy move

This ploppy decided to always double her 10's against the dealer 10. When asked if she was sure she wanted to double her 10 against the dealer 10, she kept insisting that the "book" says to do so despite the dealer even explaining to her that you should only double when you currently have the advantage. I even discreetly showed her the basic strategy chart because she had been nice enough to let me double on her hand once, and she still kept doubling her 10's against a dealer 10!!:laugh::laugh: Go figure.