The statement was written by a crew member who was active on this flight.
It was posted on pprune.org a week or so ago. You may question the validity or accuracy of the statement, which is fine. But the FACT of the matter is:
the flight attendant in question is still on active duty and the captain in question has been temporarily suspended by UAL and the FAA, who is also investigating, has temporarily yanked his certificate. Additionally, the captain in question was just back from extended sick leave after suffering a knee injury. In all due fairness to the captain, perhaps the knee injury was bothering him so much that he became crotchety or irritable? I could understand that. But cannot understand, based only on the first-hand report, why he would divert. But I do know that, again, there are two sides to every story.