I think most schools these days offer both “dress” and “casual” poses.
The dress photos are generally the ones that show up in the annual.
Even so, I would not have been caught dead in a tank top in a yearbook photo (even a “casual” one).
Oh well, times change, I guess.
As to my second point: why does everyone have to go nuts today? Why can’t the boy submit to authority? He’s going to have to one day. Why does the father have to get all worked up? My dad would have said: them’s the rules, obey them.
These are rhetorical questions, of course.