"The truth"....
Cardiff is hardly a PL giant, both times they have been promoted in recent years they have been relegated again the following season and when he took over they were in deep shit. Did he do well? No, but is it really relevant today?. Its like calling Klopp "failed Mainz manager" Its utterly daft. Besides, like him or not as a manager, Ole is still a club legend, so why go out of your way to call him derogatory nicknames?
And even if we accept the premise that he failed as Cardiff manager, its a bit cnutish to use that against him years later. I have a friend who once shat himself at a party while he was in bed with some girl. Drank to much and had a sketchy kebab and when he tried to sneak out a fart he literally shat the bed. We could have called him "party pooper" for the rest of his life, but we dont because that being a cnut