This is simply not true.  People are customarily addressed by the title of the highest position they have held.  That's why Hillary is still addressed as Secretary Clinton, and Mitt Romney is still addressed as Governor Romney.  (JFK's father was addressed as Ambassador Kennedy till his stroke isolated him.)  Former presidents will always be President Obama, Clinton, Bush, etc.   No exception is being made to honor President Obama, and no exception should be made to exclude him from this customary honor, either.