Saturday Night Live (SNL) has been criticised for a sketch about Tourette syndrome, with a charity saying it was "not acceptable". The US TV comedy show depicted a series of controversial celebrities blaming their behaviour on the condition, which can cause involuntary verbal tics. The sketch, which was posted on social media, came in the wake of a furore after a Tourette's campaigner involuntarily shouted a racial slur while two black actors were on stage at last weekend's Bafta Awards. Emma McNally, CEO of Tourette Action, said: "We had hoped this would be a new week and we could move on but the release of further content online that has been designed to ridicule Tourette's and reduce our community to a punchline has only deepened that hurt." She continued: "I want to be completely clear here: THIS IS NOT ACCEPTABLE. "Mocking a disability is never acceptable.…