South Australia's Commissioner for Aboriginal Children and Young People has spoken out against a "deeply offensive" social media video posted by an Adelaide comedian in the wake of the death of Kumanjayi Little Baby in Alice Springs last week.The post on social media, by Alex "Shooter" Williamson, showed him imagining a phone call made by the girl's parents to alleged murderer Jefferson Lewis.It has since been deleted.SA Commissioner for Aboriginal Children and Young People Dale Agius said the child's death "has broken the hearts of Aboriginal and Torres Strait Islander peoples across this country and all Australians of good conscience"."What Mr Williamson posted was not comedy It was cruelty dressed up as a joke, wielded against a community already grieving," he said in a statement on Tuesday."To exploit the kidnapping and murder of a five-year-old Aboriginal child for cheap laughs, and to role-play a conversation with the man charged with her murder, is not a punchline. "It is racism dressed up as comedy