Okay, just imagine if this would have been a white male student walking out of his graduation, and the cries of "disrespect" to any females and minorities in attendance. It would have become an entire meme of white males only caring about themselves, and leaving everyone else behind.
This was just complete rudeness all around. The article notes in passing that it could be a problem for the kids at the end of the alphabet, then just kind of ignores the point it just made.