As British politics has got crueller, our comedy has gone in the opposite direction, becoming a haven of decency and diversity. In this extract from his new book, Different Times, David Stubbs asks if these gentler comics are the new cutting edge There was once a pub called the Mucky Pup, my favourite in London. I drank there, did quizzes there, DJ-ed there, danced there, ate vegetarian roasts there. The Mucky Pup is…