Why couldn’t Avraham Avinu keep Yishmael? I mean, he wasn’t Yitzchok. He wasn’t made out of the same stuff. So he acted up! He made a mistake. Did he really have to kick him out in the prime of his life? According to two out of three Pshatim he didn’t hurt anyone.
As I said earlier, you have to put yourself into another society’s mindset and judge from there. That is the basic meaning of Ad Shetagia Limikomo. The inability to do so, is what drove the western powers to try to influence other people’s values, and urn their disdain, and what caused this recent uproar about the picture.
In one community it is considered acceptable, innocent, or even ‘Mentchlich’. In another community, as in this mythical Yeshiva, in is not only unacceptable, but unheard of and completely out of the box.
The problem is that a good boy of such a Yeshiva would not casually fall in to this. Second of all, he would not be surprized by the Hanhala’s reaction. Third of all, it would not be considered alleged after the facts are undebated. All this and more (timing, “yenta” …) tells us that the OP probably made it up as he went along.