The person asserts themselves, and tells the interrupting man not to interrupt.
That person is more likely to be seen as confident or assertive if they're a man, and more likely to be seen as shrill or bitchy if they're a woman.
> I have never once seen this particular double standard applied. I say this as someone with both a keen eye for and a near zero tolerance of prejudice and discrimination of any kind.
I'm surprised by this, because it's very very common, and has been written about in national newspapers in different countries.
http://www.nytimes.com/2015/01/11/opinion/sunday/speaking-wh...
http://time.com/3666135/sheryl-sandberg-talking-while-female...
http://nytlive.nytimes.com/womenintheworld/2015/03/19/google...
http://www.forbes.com/sites/womensmedia/2012/12/03/womens-id...
http://womeninastronomy.blogspot.co.uk/2014/07/stop-interrup...
etc etc.