Being 25 years in this buisness and flying more than 300k miles a year, I have no understanding for such people.
Beside that they are a risk of safety, they disturb all other passengers, which simply wnat to have a quiet flight from A to B.
But we are not only talking about students. I am hating this "businessmen", who are not willing to switch off their phones even the aircraft reaches Vr. All crews shoudl make it like a crew I had a month ago. The guy did not listen during take-off, he did not listen for landing. When the door opened, two policeman waited for him and I am sure he missed his connection.
Full understanding for all crews, which are not accepting unruly passengers.