The cheering, horns, etc, are the worst part for most of the rest of the students and for the faculty and staff sitting through the ceremony.
You can’t hear the next two or three names of students who follow and it frequently extends the time needed to get everyone through with the recognition they deserve.
The last thing most students want is to have the ceremonies take longer than it should. They’ve been sitting for hours, usually in a warm auditorium or in the direct sunlight in hot regalia and most of them want to march out, greet their families with their diploma, and get on with their personal celebrations.
These individual displays are nothing more than an example of bad manners and being inconsiderate.
I’ve sat on the stage through dozens of these, including several of my own. Holding up the flow for individual recognition is not appreciated by the larger audience or participants.
I’m referring to university graduations although I’ve attended a number of high school graduations over the years and those are worse. I won’t attend any HS graduation other than for my grandchildren.