According to my source, in the marine core, whenever the senior group is about to graduate, they tell the new recruits who’ve just come in that they are having a much easier time than the ones graduating. Depending on who’s in charge and the current politics, it actually does fluctuate in difficulty, but the graduating class always tells the newer recruits this even if it’s slightly untrue. Regardless, there’s no such thing as easy marine core boot camp. According to my source, it’s so difficult that half the guys don’t make it to graduation.
My source heard this when he was beginning his training when he was in his 20s, and says that the men who do it do so to make themselves feel better and make the new group feel like they’re not as tough as older ones are. He claims that it’s human nature to want to think that you’re better and stronger than the next guy coming through. It may also be that intimidating the new trainees into wanting to be better and stronger than the group before them is both a sort of initiation ritual and a way to sort of inspire the new recruits.
I’ve personally seen this sort of thing in junior high and high school regarding certain classes and P.E., so it’s definitely seen outside of this setting and can apply towards different situations.