Of course, we can't tell from posts whether or not some people SHOUT and therefore think that SHOUTING is the best way to get a point across (it's not)! But the American professor of literature was a shouter, talked over other people, waved her arms around and pulled faces whenever anyone else spoke.
The other American woman had a slightly supercilious sneer on her face all the time and Tasmina Ahmed-Sheikh is also off-puttingly loud (and yes, we did turn the sound down)
I think many people are put off listening to the content of someone's answers when the delivery is loud and forceful.
Yvette Cooper was a civilised contrast.
As I used to say to my DC - you will get your point across much better if you don't shout and it is rude not to consider other people's point of view and shout them down.