In 2010 he said he had arsehole like tendencies. That's some time ago, I think it's a stretch to say that it makes him one. I've agreed with you right up to this point!
Well, he engaged in 'arsehole like tendencies' two days ago. When an alcoholic is on the wagon for a long time and then falls off again, they're still an alcoholic.
Comparing an alcoholic to an arsehole is absurd. An alcoholic can never touch a drop of alcohol for fear of getting addicted to it again. Someone can be an arsehole some of the time, and very nice the rest of the time!