I'll buy that. If this disproportionately affects women then I'll buy that too. I don't buy that men interrupt women specifically out of some sort of bias. My experience has been that the more passionate conversationalists among us will interrupt anyone who will let them.
You were right in your initial assertion: people talk over people. The people desperately trying to prove that "men talk over women" using statistical analysis are all missing the point.
The first thing to do, before looking for sex differences, is to try and identify the reasons why people interrupt, because there are many of them and sometimes there are conflicting or related motives.
Gathering anecdotal evidence would be a starting point for articulating hypotheses. What are the conditions of the discussion? What is at stake? What is the expertise of the participants? What are the personality factors? What is the general conversational ability of each participant? How long is the attention span of each participant? What is the apparent purpose of each individual interruption?
There are so many factors you could look for before looking at sex differences. And would the sex differences persist when those factors were controlled for?
a nice way of saying workplace bullies.
But hey, I mostly rein it in :)
That being said, it seems to me that the broader implication of your position is that when men and women participate in group dialogue the meta-game of the dialogue often leans in favor of the male speakers. I'd need to do more research to prove this but in general, if this was your position, I'd be inclined to agree with it based on my own anecdotal experiences. However, this still doesn't establish the hostile intention or implicit sexism that, from my reading of your posts, is presented in your claims.