Apart from insulting Wenger, which we all do, he wasn't unbearable in his first Chelsea era. And even at Inter, he was rather well-behaved.
But then he hit Madrid, and things went south. Frequent outbursts, poking Tito in the eye, mistreating the Chelsea doctor, getting multiple Real players to earn yellow cards against Ajax, dumping Mata unceremoniously, going after Hazard and Matic publicly, insulting the Benitez family, calling Pellegrini Pellegrino and belittling him after assuming his role at Madrid, and of course disrespecting Eva when she was doing her job. I'm sure I've missed a few big ones. But his nonsense really accelerated once he got to Real Madrid, and he's been dead to me since.