That's not good enough - I would definitely escalate further. This suggests if it happens again twice, she would be in trouble.
I would complain both about the tone and content of the above.
The BBC has a lot to answer for here. Yes they need to be balanced, but always giving equal weight to everyone in every argument is crazy.
Brexit is the perfect example, for every economist (out of thousands they could choose from) who said it was a bad idea, they'd have to put up the one who...