I use "So" and "Okay, so," all the time because...erm...I think it makes me sound colloquial.
Not a problem if you're using them in statements. But if you begin every response to a question with "OK, so," you need to stop doing that.
There's not much that producers can do about the remarks made by people in live interviews.
A well-timed bitch-slapping might not be uncalled for.
This is an intelligent, well-educated and articulate woman.
These days I'm hearing it more from academics in the hard sciences.