Frankly, telling the student to ‘just shut up’ should be done in a one-on-one with the student, perhaps giving him a time for just him to relate his experiences privately to the instructor, and then explaining that you (instructor) also have other obligations to the collective class that are made more difficult by the interruptions. Just a thought.
But he will NOT stop, even interrupting other students.
Been forced to yank his leash. . .in class. It is working.
All too often many students have never been expected to behave responsibly or in an adult manner. I do. Most get it after a class or two, some, like this guy, do not.
After a few classes most all of my students know what is acceptable behavior and adapt and actually act and speak as a mature adult.
It is a matter of expectation.