Pete Sixsmith has not been the world’s most cheerful chappie this season. He was in decidedly happier fettle after yesterday’s sweet demolition job, finding warm words of praise for the entire Sunderland team, spirited and dominant as they were, and for the fans’ equally spirited mockery of the ineffectual pantomime villain, Kevin Nolan. He even offers sporting applause to the sizeable away support who must have been appalled by what they saw but kept up decent encouragement of their players throughout …