Investigative journalist Lee Fang goes deeper into Hasan's allegations about Taibbi – plus Hasan's history of plagiarism & viewpoint-flexible controversialism-for-pay at:
https://www.leefang.com/p/mehdi-hasan-plagiarized-pro-spanki...
As for the plagiarism, the article in question is from over 20 years ago, hardly a slam dunk nor is it a representative of his journalistic career. The only reason Fang wrote that is because Mehdi accused him of Islamophobia, it's just petty and desperate nonsense.
The other Fang allegations – including that Hasan now condemns & slurs people for the same sorts of socially-conservative views Hasan once espoused (& maybe still holds in his heart?) also seem well-sourced.
Tucker Carlson or Sean Hannity have also "wiped the floor" against remote guests, on their shouty home-field cable TV shows. It's a medium for idiocy: slick & shameless verbal bullies win there, and anyone who adopts their news/views from such interactions remains stuck in a partisanship-addled haze.
Then he hammered Taibbi for an hour on those two errors, as if he were a career fraudster, instead of a lion of journalism.
Mehdi Hasan is a fraud, an establishment actor on a failing corporate propaganda news network no one takes seriously. A tool of his billionaire owners and of the Biden neocons.
Petty and desperate nonsense indeed.