Demi Lovato has spoken out against Piers Morgan who accused her of being a “bully” in a recent row about a frozen yoghurt shop.The Dancing with the Devil singer, 28, has responded to the former Good Morning Britain’s latest column in which he called her a “repulsively arrogant woman” for shaming a frozen yoghurt store for selling sugar free baked goods.The diva took to Instagram stories to address the drama, admitting that she is a naturally outspoken person.