This was handled very badly all around. The teacher should have made clear that interrupting a class by "talking during class" is not respectful. The emphasis should never have been what was being spoken, but when. There is a time and place for everything. Like by being respectful in turning off your cell phone during class, meetings, church, funerals, weddng, the movie. This student should have been reprimanded for interruption, not for using a different language.