If I see other people do it I make a point to circle back to the person who was cut off immediately after the person who cut them off finishes and make a commen

If I see other people do it I make a point to circle back to the person who was cut off immediately after the person who cut them off finishes and make a comment like "Sorry you were cut off, you were saying." That being said, know your audience before taking that approach. I wouldn't do it to an executive for example but I have no problem doing it to a director or manager (people in my experience who are notorious for doing this).