Obamas NOT invited to royal wedding

Nancy Reagan attended the wedding of Charles and Diana, but Michele Obama will not be getting an invitation to the wedding of William and Kate. Why? It seems that when the Obamas met with Queen Elizabeth, Michele Obama wrapped her arm around the Queen even though she had been told no one ever touches the Queen. It is being said that the Royal Family was outraged. William said the Obamas were disrespectful to his grandmother and he does not want them at his wedding. He also does not approve of the way the Obamas take so many expensive vacations during tough economic times for many Americans. Is this true?