She was disciplined for giving her opinion.
The actual conversation
Munchetty: Every time I have been told, as a woman of colour, to go back to where I came from, that was embedded in racism. Now I'm not accusing anyone of anything here but you know what certain phrases mean.
Walker: Do you hear that quite regularly?
Munchetty: Yes. Not regularly, but I've been told it.
Walker: You're sitting here not giving an opinion, but how do you feel as someone when you've been told that before, and when you hear that from him?
Munchetty: Furious. Absolutely furious. And I imagine a lot of people in this country will be feeling absolutely furious that a man in that position feels it's OK to skirt the lines with using language like that.
Walker: Do you feel his use of that then legitimises other people to use this…
Munchetty: Yes. Yes.
Walker: As our guest was saying there, it feels like a thought-out strategy to strengthen his position.
Munchetty: And it is not enough to do it just to get attention. He's in a responsible position. Anyway I'm not here to give my opinion.
Perhaps Walker should have been disciplined for asking her and pushing the point.