Hyperbole aside, she's clearly dropped any pretense of objectivity and is attacking Mr. Hannan.
A journalist should ask probing questions and allow the interviewee to respond. Push back if they think the interviewee is avoiding the question, but her reaction to being called out on wrong information is to ignore it.
SHE becomes the one avoiding the truth in the interview. It's a revealing case of the mask not just slipping, but being fully ripped off.
I believe that, in large part, journalism is dead in terms of investigating something for purposes of finding the truth. Instead, what you have are TV reporters whose goal is to achieve stardom, by means of obtaining the best possible ratings or generating the greatest social media traffic. The major news outlets have by and large transformed from news reporting and investigative resources to tools of their owners to advance whatever positions that owner holds on the issues of the day. The same is true to a degree of the online bloggers and quasi-news sources.
Everyone has an angle, and shapes their reporting based on that angle. Here, she tried to advance her angle, got slapped down. But, at the same time, she's getting a lot of attention. And, I'm sure to those who share her point of view on Brexit, she's probably a hero fighting to expose the truth that Brexit=racism. So, she accomplished her goal, though not likely in the way she planned.