I get talked over all the time. I usually chalk it up to being an American living in America, but with a more Scandinavian/Minnesotan conversational style.
That is, I will pause while speaking, spooling my next thought out to the phonological loop, to review and filter it, before streaming it out through the voice apparatus, but then some jackass will use that break to assume conversational priority when I haven't yielded it yet. So when I resume speaking, they are already talking.
It is practically impossible for me to engage in a conversation with such a person constantly ruining it for me, so I usually just keep my thoughts to myself and regret even showing up for the party.
Even my spouse does this in a 1-on-1 conversation. And then I am the one accused of interrupting, as though it is acceptable to jump in between two sentences of a paragraph. It's like I need that stupid conch shell from Lord of the Flies in order to say everything that I want to say. And I get so irritated when people spew out a stream of content-free babble, for the sole purpose of maintaining priority, to the point where I forget what I have been wanting to say for the last 5 minutes.
It might be a sexist thing, but I think it's more likely that the people with the least latency between brain and larynx--and therefore the fewest speech filters--are the ones that never learned that conversational priority isn't just about refraining from talking while sound is still coming out of someone else's mouth. And, of course, there are also the people who simply decide they are the most important person in a conversation and act like they're the lead actor giving a monologue, and everyone else is the chorus.
So please, have a care as to whether a silence in the conversation is a pause or a yield. You may be interrupting someone giving due consideration to what they will say next.