By Emma Rowbottom A disgruntled woman has been shamed for mocking her soon-to-be sister-in-law for being attractive, successful, and generous. Admitting she ‘can’t stand her brother’s fiancée’, the woman wrote a letter to Carolyn Hanley Hax, an American writer and columnist for The Washington Post explaining exactly why she shouldn’t be allowed to join her family. But Carolyn gave her a stark wake-up call, saying she needed to take a long hard look at herself because she’s the problem. In the letter, she wrote: “One weekend last summer we all stayed with him. And I cannot stand his fiancée.” A…