A British jihadi posted a gripe-fest about the Islamic State on his Tumblr account, ripping on Arab manners including other jihadists walking off with his shoes.Omar Hussain, a 27-year-old former grocery employee from southern England, goes by Abu Sa’eed Al-Britani since running off to join ISIS. He frequently writes PR, including an appeal for doctors to come to the Islamic State, and other missives.His post on the “Culture Clash†is, like other writings, pulled from his “Message of a Mujahid†video series. His first complaint is that Arab get up in others’ private space too much.“They see no issue in...