My experience has been less simple interruption in excited conversation - that happens with everyone - but particularly assertive/competitive males who will "railroad" conversation completely to have their voice and opinion dominate. They do it to both men and women, but especially quieter and soft-spoken women. I think they are the sort of people who tend to think that if opinions are hesitant or voiced with uncertainty or take a while to get out, they are not useful, which of course is not true. I think it's in part a gender thing but also just partially a personality thing. There are women who dominate conversation, too.