Sometimes, the statement 'the glass was half full' is more reasonable than 'OH MY GOD, THIS GLASS OF MILK, IT WAS NOT COMPLETELY FULL! I AM FILLED WITH ANGUISH AND TORMENT BY ITS HALF-FULLNESS! ALSO I AM LACTOSE INTOLERANT! WHY WAS EVEN HALF A GLASS OF MILK GIVEN TO ME, ARE YOU PEOPLE ALL TRYING TO KILL ME???'
If you're attempting to provide valid criticism to others, it can be of help to step outside of your own subjective opinion and frame your thought as objectively as possible. It can even be of great help to do this.