Do the two of them really hate each other or is it (extreme) friendly banter?
I haven't really paid much attention to either of them in the past but I've read that Alan Sugar fired him once on the Apprentice - is that a cause of their twitter bickering?
Answer on Is Alan Sugar and Piers Morgan's feud real?
Sugar is bickering with a few people on twitter including kirsty alsop
my estimation of sugar is at an all time low
his book is boring too ,